Nortel Networks Mediant TP-1610 SIP - Manual (Page 232)

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