AudioCodes Mediant 500L - Page 754

User's Manual 754 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
the REGISTER messages to add a special parameter ("ac-int=<value>") to the
Contact header to identify the SIP Interface on which each message is received. For
example:
• REGISTER for Primary Proxy received on SIP Interface "Interface-1":
REGISTER
To: sip:100@audc.com
Contact: <sip:100@172.17.100.20;ac-int=1>
• REGISTER for Secondary Proxy received on SIP Interface "Interface-2":
REGISTER
To: sip:100@audc.com
Contact: <sip:100@172.17.100.20;ac-int=2>
4. The device adds to the Contact header a special string with a unique value, "ac-
feu=<value>" for each registration (e.g., "Contact: <sip:100@172.17.100.20;ac-
int=1;ac-feu=x>").
5. The device saves the two contacts (100@172.17.100.20;ac-int=1;ac-feu=x and
100@172.17.113.32;ac- int=2;ac-feu=y) under the same AOR (100@audc.com) in its
user registration database.
The SIP call flow for dual registration is shown below:
The basic SIP call flow for INVITEs to and from the registered user is shown below: