Nortel Networks TP-1610 SIP user manual MTP2 Tunneling Technology, SS7 Characteristics

Mediant 2000 SIP

J.1 MTP2 Tunneling Technology

The SS7 tunneling technology is based on a pairing of remote and central gateways, as shown in Figure J-3. The remote gateways are configured to backhaul MTP layer 2 signaling over the IP network using standard M2UA protocol (over SCTP protocol). The function of the M2TN entity is to transmit traffic and handle all management events between MTP2 on the TDM side and M2UA's MGC (Media Gateway Controler) entity on the IP side. Only the actual SS7 MSU (Message Signaling Unit) data is sent. Management of the SS7 link is performed using M2UA without transporting the MTP2 LSSU (Link Status Signaling Unit) and FISU (Fill in Signaling Unit) messages over IP. These messages, in addition to MTP2 timing, are terminated and supported, respectively, by the remote and central sides. Therefore, the MTP2 connections are not affected by the fact that they are transported over IP.

Figure J-3: Protocol Architecture for MTP2 Tunneling

J.2 SS7 Characteristics

•Only standard protocols are used on external interfaces (MTP2 on PSTN side, and M2UA over SCTP on IP side) - the M2TN application resides internally in the Mediant 2000.

•No extra signaling point codes are required; both endpoints are unaware that the SS7 connection is via IP.

•Several links from multiple SS7 nodes can be concentrated into a single board on the ‘Central’ side (using several SCTP associations per gateway).

•Mediant 2000 gateways can handle SS7 MTP2 tunneling and voice concurrently (does not require additional gateway or other server).

•Voice and signaling can be transferred on the same E1/T1 trunk (F-Links).

•IP traffic can be monitored via standard sniffing tools (e.g. protocol analyzers).

Mediant 2000 SIP User’s Manual 232 Document #: LTRT-72504