SIP User's Manual 468 Document #: LTRT-12801
MP-500 MSBG
If registrations are destined to the database (using the above rules), the device does not
attempt to find a database match, but instead replies with 200 OK (used for Survivability).
Once a match is found, the request is routed either to the contact received in the initial
registration or (if the device identifies that the user agent is behind a NAT) to the source IP
address of the initial registration.
9.2.4.4 Registration Refreshes
Registration refreshes are incoming REGISTER requests that are associated with a specific
registered user. The association is performed by searching the internal registration
database. These refreshes are routed to the serving proxy only if the serving proxy Expires
time is about to expire; otherwise, the device responds with a 200 OK without routing the
REGISTER. Each such refreshes also refresh the internal timer time set on the device for
this specific registration.
9.2.5 SBC Configuration Example
This section provides a basic SBC configuration example. You can also view enhanced
SBC examples in the following subsections:
îš„ Survivability and Alternative Routing on page 474 - su
rvivability and alternative routing
îš„ Coder Transcoding - coder transcoding
îš„ ''SIP URI Manipulation'' on page 477 - SIP URI use
r and host part manipulation
For a full description of this basic example, refer to the Installation Manual.
This example assumes the following:
îš„ Enterprise with deployed MP-500, interfacing between enterprise's LAN IP phones and
WAN (using a hosted IP-PBX).
îš„ LAN signaling leg IP address = 192.168.0.2:5080 (LAN SIP Interface pertaining to the
LAN SRD)
îš„ WAN signaling leg IP address = 10.33.2.105:5060 (WAN SIP Interface pertaining to
the WAN SRD)
îš„ Two IP Groups:
• IP Group 1 (USER): represents a LAN user agent (e.g., IP phone) with IP address
192.168.0.3
• IP Group 2 (SERVER): IP-PBX defined using a Proxy Set with IP address
10.33.2.26 (pertaining to the WAN SRD)
îš„ Media (RTP) traffic (packets) sent from the LAN leg's UDP port 6000-6190 to the WAN
leg's UDP port 7000-7190
îš„ SIP signaling entity: SIP signaling packets sent from the LAN leg's UDP port 5080 to
the WAN leg's UDP port 5060
îš„ WAN-LAN port forwarding required for the above (SIP and RTP)
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