Figure 8-2: Back-To-Back Sbc Call Flow (Rtp And Signaling) - AudioCodes Mediant 800 MSBG User Manual

SIP User's Manual
Each SRD may be associated with up to three SIP Interfaces (one per application type -
SAS, Gateway\IP-to-IP, and SBC). Each SIP Interface must have a unique signaling port
(i.e., no two SIP Interfaces can share the same port - no overlapping).
SIP Interfaces are used for the following:
Defining different SIP signaling ports (listening UDP, TCP, and TLS, and the UDP
source ports) for single or multiple interfaces.
Differentiating between the different application types supported by the device. Only
one signaling interface per application type is allowed per SRD. An SRD can be
associated with many SIP interfaces which are based on one Layer-3 interface, with
different ports.
Separating signaling traffic of different customers to use different routing tables,
manipulations, SIP definitions, etc.
The figure below illustrates the SBC call flow between an enterprises LAN (IP PBX) and an
ITSP (WAN) implementing different interfaces (IP addresses and ports) for RTP packets
and SIP signaling. In addition, for each leg (LAN and WAN side), different interfaces are
used.
The example uses the following IP addresses:
IP-PBX: 10.2.2.6
LAN MSBG: 10.2.2.3
WAN MSBG: 212.179.1.12
ITSP: 212.179.1.13
MSBG LAN Media: 10.2.2.2:5000-6000
MSBG WAN Media: 212.179.1.11:7000-8000

Figure 8-2: Back-to-Back SBC Call Flow (RTP and Signaling)

Figure 8-3: Back-to-Back SBC Call Flow (RTP and Signaling)
Version 6.2 407
8. IP Telephony Capabilities
February 2011