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<title>Message Transfer Part</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Message Transfer Part</span></span>

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</style><table class="infobox"><caption class="infobox-title"><a href="Signalling_System_No._7" title="Signalling System No. 7">SS7 protocol suite</a></caption><tbody><tr><td colspan="2" class="infobox-subheader">SS7 protocols by OSI layer</td></tr><tr><th scope="row" class="infobox-label"><a href="Application_layer" title="Application layer">Application</a></th><td class="infobox-data"><a href="INAP" title="INAP">INAP</a>, <a href="Mobile_Application_Part" title="Mobile Application Part">MAP</a>, <a href="IS-41" title="IS-41">IS-41</a>...<br>

<a href="Transaction_Capabilities_Application_Part" title="Transaction Capabilities Application Part">TCAP</a>, <a href="CAMEL_Application_Part" title="CAMEL Application Part">CAP</a>, <a href="ISDN_User_Part" title="ISDN User Part">ISUP</a>, ...</td></tr><tr><th scope="row" class="infobox-label"><a href="Network_layer" title="Network layer">Network</a></th><td class="infobox-data"> + <a href="Signalling_Connection_Control_Part" title="Signalling Connection Control Part">SCCP</a></td></tr><tr><th scope="row" class="infobox-label"><a href="Data_link_layer" title="Data link layer">Data link</a></th><td class="infobox-data"></td></tr><tr><th scope="row" class="infobox-label"><a href="Physical_layer" title="Physical layer">Physical</a></th><td class="infobox-data"></td></tr><tr><td colspan="2" class="infobox-navbar"><style data-mw-deduplicate="TemplateStyles:r1129693374">

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<p>The <b>Message Transfer Part</b> (MTP) is part of the <a href="Signaling_System_7" class="mw-redirect" title="Signaling System 7">Signaling System 7</a> (SS7) used for communication in <a href="Public_Switched_Telephone_Network" class="mw-redirect" title="Public Switched Telephone Network">Public Switched Telephone Networks</a>. MTP is responsible for reliable, unduplicated and in-sequence transport of SS7 messages between communication partners.

</p><p>MTP is formally defined primarily in <a href="ITU-T" title="ITU-T">ITU-T</a> recommendations

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.701/en/">Q.701</a>,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.702/en/">Q.702</a>,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.703/en/">Q.703</a>,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.704/en/">Q.704</a> and

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.705/en/">Q.705</a>.

Tests for the MTP are specified in the <a href="ITU-T" title="ITU-T">ITU-T</a> recommendations

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.781/en/">Q.781</a> for MTP2 and in

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.782/en/">Q.782</a> for MTP3. These tests are used to validate the correct implementation of the MTP protocol.

</p><p>Different countries use different variants of the MTP protocols. In North America, the formal standard followed is <a href="ANSI" class="mw-redirect" title="ANSI">ANSI</a> T1.111. In Europe, national MTP protocols are based on <a href="ETSI" class="mw-redirect" title="ETSI">ETSI</a>

<a rel="nofollow" class="external text" href="http://webapp.etsi.org/workprogram/Report_WorkItem.asp?WKI_ID=19130">EN 300-0088-1</a>.

</p>

<div class="mw-heading mw-heading2"><h2 id="Functional_levels">Functional levels</h2></div>

<p>The <a href="Signaling_System_7" class="mw-redirect" title="Signaling System 7">SS7</a> stack can be separated into four functional levels:<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

Level 1 through Level 3 comprise the <i>MTP</i>, and Level 4 the <i>MTP user</i>. <i>MTP Level 3</i> is sometimes abbreviated <i>MTP3</i>; <i>MTP Level 2</i>, <i>MTP2</i>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> MTP and <a href="Signalling_Connection_Control_Part" title="Signalling Connection Control Part">SCCP</a> are together referred to as the <i>Network Service Part (NSP)</i>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

</p><p>There is no one-to-one mapping of MTP Levels 1 through 3 onto the <a href="OSI_model" title="OSI model">OSI model</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Instead, MTP provides the functionality of <a href="Layer_1" class="mw-redirect" title="Layer 1">layers 1</a>, <a href="Layer_2" class="mw-redirect" title="Layer 2">2</a> and part of <a href="Layer_3" class="mw-redirect" title="Layer 3">layer 3</a> in the <a href="OSI_model" title="OSI model">OSI model</a>.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> The part of layer 3 of the <a href="OSI_model" title="OSI model">OSI model</a> that MTP does not provide, is provided by <a href="Signalling_Connection_Control_Part" title="Signalling Connection Control Part">SCCP</a> or other Level 4 parts (MTP users).<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-q1400fig1_7-0" class="reference"><a href="#cite_note-q1400fig1-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading3"><h3 id="Signalling_Data_Link_Functional_Level">Signalling Data Link Functional Level</h3></div>

<p><i>MTP Level 1</i> is described in <a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.702/en/">ITU-T Recommendation Q.702</a>, and provides the <i>Signalling Data Link</i> functional level for narrowband signalling links. For broadband signalling links,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2110/en/">ITU-T Recommendation Q.2110</a> or

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2111/en/">Q.2111</a> describe the signalling data link function.

</p><p>MTP1 represents the physical layer. That is, the layer that is responsible for the connection of SS7 Signaling Points into the transmission network over which they communicate with each other. Primarily, this involves the conversion of messaging into electrical signal and the maintenance of the physical links through which these pass. In this way, it is analogous to the Layer 1 of ISDN or other, perhaps more familiar, protocols.

</p><p>MTP1 normally uses a timeslot in an <a href="E-carrier" title="E-carrier">E-carrier</a> or <a href="T-carrier" title="T-carrier">T-carrier</a>. The Physical interfaces defined include E-1 (2048 kbit/s; 32 64 kbit/s channels), DS-1 (1544 kbit/s; 24 64 kbit/s channels), V.35 (64 kbit/s), DS-0 (64 kbit/s), and DS-0A (56 kbit/s).

</p>

<div class="mw-heading mw-heading3"><h3 id="Signalling_Link_Functional_Level">Signalling Link Functional Level</h3></div>

<p><i>MTP Level 2</i> is described in <a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.703/en/">ITU-T Recommendation Q.703</a>, and provides the <i>Signalling Link</i> functional level for narrowband signalling links. For broadband signalling links,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2140/en/">ITU-T Recommendation Q.2140</a> and

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2210/en/">Q.2210</a> describe the signalling link function referred to as <i>MTP3b</i>. The signalling link functional level may also be provided using the <a href="SIGTRAN" title="SIGTRAN">SIGTRAN</a> protocol M2PA described in RFC 4165.

</p><p><i>MTP Level 2</i> ensures accurate end-to-end transmission of a message

across a signaling link.

</p><p>MTP2 provides flow control, error detection and sequence checking, and retransmits unacknowledged messages. MTP2 uses packets called <i>signal units</i> to transmit SS7 messages. There are three types of signal units: Fill-in Signal Unit (FISU), Link Status Signal Unit (LSSU), Message Signal Unit (MSU).

</p><p>Access to the signalling link functional level's service interface can be provided over <a href="Stream_Control_Transmission_Protocol" title="Stream Control Transmission Protocol">SCTP</a> by the <a href="SIGTRAN" title="SIGTRAN">SIGTRAN</a> protocol M2UA, described in RFC 3331.

</p><p>MTP Level 2 is tested using the protocol tester and test specifications described in

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.755/en/">Q.755</a>,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.755.1/en/">Q.755.1</a>,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.780/en/">Q.780</a> and

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.781/en/">Q.781</a>.

</p>

<div class="mw-heading mw-heading3"><h3 id="Signalling_Network_Functional_Level">Signalling Network Functional Level</h3></div>

<p><i>MTP Level 3</i> is described in <a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.704/en/">ITU-T Recommendation Q.704</a>, and provides the <i>Signalling Network</i> functional level for narrowband signalling links and, with only minor modifications described in

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2210/en/">ITU-T Recommendation Q.2210</a>, for broadband signalling links. The functions of <i>MTP Level 3</i> may also be replaced with the <i>Generic Signalling Transport Service</i> described in <a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2150.0/en/">ITU-T Recommendation Q.2150.0</a> as provided by <i>MTP3b</i> (<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2150.1/en/">Q.2150.1</a>), <i>SSCOP or SSCOPMCE</i> (<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2150.2/en/">Q.2150.2</a>) or <a href="Stream_Control_Transmission_Protocol" title="Stream Control Transmission Protocol">SCTP</a> (<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2150.3/en/">Q.2150.3</a>). <i>MTP Level 3</i> functions can also be provided by using the <a href="IETF" class="mw-redirect" title="IETF">IETF</a> <a href="SIGTRAN" title="SIGTRAN">SIGTRAN</a> <a href="M3UA" title="M3UA">M3UA</a> protocol, described in RFC 4666, in IPSP mode.

</p><p>MTP3 provides routing functionality to transport signaling messages through the SS7 network to the requested endpoint. Each network element in the SS7 network has a unique address, the <a href="Point_Code" class="mw-redirect" title="Point Code">Point Code</a> (PC). Message routing is performed according to this address. A distinction is made between a <a href="Signaling_Transfer_Point" class="mw-redirect" title="Signaling Transfer Point">Signaling Transfer Point</a> (STP) which only performs MTP message routing functionalities and a Signaling End Point (SEP) which uses MTP to communicate with other SEPs (that is, telecom switches). MTP3 is also responsible for network management; when the availability of MTP2 data links changes. MTP3 establishes alternative links and re-routes traffic away from failed links and signaling points and propagates information about route availability through the network. Also controls traffic when congestion occurs.

</p><p>Access to the signalling network functional level's service interface (as described in <a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.701/en/">Q.701</a>) can be provided over <a href="Stream_Control_Transmission_Protocol" title="Stream Control Transmission Protocol">SCTP</a> by the <a href="SIGTRAN" title="SIGTRAN">SIGTRAN</a> protocol <a href="M3UA" title="M3UA">M3UA</a>, described in RFC 4666.

</p><p>MTP Level 3 is tested using the protocol tester and test specifications described in

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.755/en/">Q.755</a>,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.755.1/en/">Q.755.1</a>,

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.780/en/">Q.780</a> and

<a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.782/en/">Q.782</a>.

</p>

<div class="mw-heading mw-heading3"><h3 id="MTP_Users">MTP Users</h3></div>

<p><i>Level 4</i> consists of <i>MTP Users</i>.

The remaining components of the <a href="Signaling_System_7" class="mw-redirect" title="Signaling System 7">SS7</a> stack are all directly, or indirectly, <i>MTP Users</i>. Some examples of parts at <i>Level 4</i> are <a href="Signalling_Connection_Control_Part" title="Signalling Connection Control Part">SCCP</a>, <a href="ISDN_User_Part" title="ISDN User Part">ISUP</a>, <a href="Telephone_User_Part" title="Telephone User Part">TUP</a>, and, in the UK, <a href="Interconnect_User_Part" title="Interconnect User Part">IUP</a>.<sup id="cite_ref-q1400fig1_7-1" class="reference"><a href="#cite_note-q1400fig1-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> The services provided to <i>MTP Level 4</i> by the <i>MTP</i> (that is, MTP to MTP Users) is described in <a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.701/en/">ITU-T Recommendation Q.701</a>.775148760

</p>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.700-199303-I/en/">ITU-T Recommendation Q.700</a>, Figure 3/Q.700, <i>SS No. 7 functional levels</i>, p. 8.</span>

</li>

<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">See for example, RFC 3331 and RFC 3332 for the usage <i>MTP2</i> and <i>MTP3</i>.</span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.711-200103-I/en/">ITU-T Recommendation Q.711 (03/2001)</a>, Figure 1/Q.711, <i>Functional diagram for the SCCP in Signalling System No. 7</i>, p. 2.</span>

</li>

<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.700-199303-I/en/">ITU-T Recommendation Q.700 (03/1993)</a>, Clause 4, <i>OSI layering and SS No. 7</i>, p. 9.</span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.700-199303-I/en/">ITU-T Recommendation Q.700 (03/1993)</a>, Figure 2/Q.700, <i>Architecture of SS No. 7</i>, p. 7.</span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.1400-199303-I/en/">ITU-T Recommendation Q.1400 (03/1993)</a>, Clause 2.2, <i>OSI layering and SS No. 7</i>, p. 4.</span>

</li>

<li id="cite_note-q1400fig1-7"><span class="mw-cite-backlink">^ <a href="#cite_ref-q1400fig1_7-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-q1400fig1_7-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.1400-199303-I/en/">ITU-T Recommendation Q.1400 (03/1993)</a>, Figure 1/Q.1400, <i>Relationship between SS No. 7 Functional Levels and OSI Layering</i>, p. 5.</span>

</li>

</ol></div></div>

<dl><dt>ITU-T recommendations</dt></dl>

<ul><li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.700/en/">ITU-T Recommendation Q.700</a>, <i>Introduction to CCITT Signalling System No. 7</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.701/en/">ITU-T Recommendation Q.701</a>, <i>Functional description of the message transfer part (MTP) of Signalling System No. 7</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.702/en/">ITU-T Recommendation Q.702</a>, <i>Signalling data link</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.703/en/">ITU-T Recommendation Q.703</a>, <i>Signalling link</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.704/en/">ITU-T Recommendation Q.704</a>, <i>Signalling network functions and messages</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.705/en/">ITU-T Recommendation Q.705</a>, <i>Signalling network structure</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.706/en/">ITU-T Recommendation Q.706</a>, <i>Message transfer part signalling performance</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.707/en/">ITU-T Recommendation Q.707</a>, <i>Testing and maintenance</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.708/en/">ITU-T Recommendation Q.708</a>, <i>Assignment procedures for international signalling point codes</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.709/en/">ITU-T Recommendation Q.709</a>, <i>Hypothetical signalling reference connection</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.710/en/">ITU-T Recommendation Q.710</a>, <i>Simplified MTP version for small systems</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.750/en/">ITU-T Recommendation Q.750</a>, <i>Overview of Signalling System No. 7 management</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.751.1/en/">ITU-T Recommendation Q.751.1</a>, <i>Network element management information model for the Message Transfer Part (MTP)</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.751.3/en/">ITU-T Recommendation Q.751.3</a>, <i>Network element information model for MTP accounting</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.752/en/">ITU-T Recommendation Q.752</a>, <i>Monitoring and measurements for Signalling System No. 7 networks</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.755/en/">ITU-T Recommendation Q.755</a>, <i>Signalling System No. 7 protocol tests</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.755.1/en/">ITU-T Recommendation Q.755.1</a>, <i>MTP Protocol Tester</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.780/en/">ITU-T Recommendation Q.780</a>, <i>Signalling System No. 7 test specification — General description</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.781/en/">ITU-T Recommendation Q.781</a>, <i>MTP Level 2 test specification</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.782/en/">ITU-T Recommendation Q.782</a>, <i>MTP Level 3 test specification</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.1400/en/">ITU-T Recommendation Q.1400</a>, <i>Architecture framework for the development of signalling and OA&M protocols using OSI concepts</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2110/en/">ITU-T Recommendation Q.2110</a>, <i>B-ISDN ATM adaptation layer — Service specific connection oriented protocol (SSCOP)</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2111/en/">ITU-T Recommendation Q.2111</a>, <i>B-ISDN ATM adaptation layer — Service specific connection oriented protocol in a multilink and connectionless environment (SSCOPMCE)</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2140/en/">ITU-T Recommendation Q.2140</a>, <i>B-ISDN ATM adaptation layer — Service specific coordination function for signalling at the network node interface (SSCF at NNI)</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2150.0/en/">ITU-T Recommendation Q.2150.0</a>, <i>Generic signalling transport service</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2150.1/en/">ITU-T Recommendation Q.2150.1</a>, <i>Signalling transport converter on MTP3 and MTP3b</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2150.2/en/">ITU-T Recommendation Q.2150.2</a>, <i>Signalling transport converter on SSCOP and SSCOPMCE</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2150.3/en/">ITU-T Recommendation Q.2150.3</a>, <i>Signalling transport converter on SCTP</i>.</li>

<li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-Q.2210/en/">ITU-T Recommendation Q.2210</a>, <i>Message transfer part level 3 functions and messages using the services of ITU-T Recommendation Q.2140</i>.</li></ul>

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</style>RFC <a rel="nofollow" class="external text" href="https://www.rfc-editor.org/rfc/rfc2719">2719</a>, <i>Framework Architecture for Signaling Transport</i>.</li>

<li>RFC <a rel="nofollow" class="external text" href="https://www.rfc-editor.org/rfc/rfc4165">4165</a>, <i>Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) — User Peer-to-Peer Adaptation Layer (M2PA)</i>.</li>

<li>RFC <a rel="nofollow" class="external text" href="https://www.rfc-editor.org/rfc/rfc3331">3331</a>, <i>Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) — User Adaptation Layer (M2UA)</i></li>

<li>RFC <a rel="nofollow" class="external text" href="https://www.rfc-editor.org/rfc/rfc4666">4666</a>, <i>Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) — User Adaptation Layer (M3UA)</i></li></ul>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><a rel="nofollow" class="external autonumber" href="https://web.archive.org/web/20130202180444/http://www.cs.utexas.edu/users/vin/Classes/CS386M-Fall04/Readings/ss7_tutorial_pt.pdf">[1]</a> - SS7 Tutorial.</li></ul></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2024-04-23" href="https://en.wikipedia.org/wiki/?title=Message_Transfer_Part&oldid=1220403851">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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