Configuring Sip Response Codes For Alternative Routing Reasons - AudioCodes Mediant 3000 User Manual

29.5.4 Configuring SIP Response Codes for Alternative Routing
Reasons
The SBC Alternative Routing Reasons table lets you configure up to 20 SIP response
codes for call release (termination) reasons. If a call (outgoing SIP dialog-initiating
methods, e.g., INVITE, OPTIONS, and SUBSCRIBE messages) is released as a result of a
configured SIP code (provided in SIP 4xx, 5xx, and 6xx), the device does alternative
routing as follows: If the destination Proxy Set is configured with multiple IP addresses (see
Configuring Proxy Sets on page 296), the device first attempts to route the call to one of
these IP addresses, starting with the first listed address. If unsuccessful, the device then
searches for an alternative routing rule in the IP-to-IP Routing table (see 'Configuring SBC
IP-to-IP Routing Rules' on page 537).
Typically, the device performs alternative routing when there is no response at all to an
INVITE message. This is done after a user-defined number of INVITE re-transmissions,
configured by the SIPMaxRtx parameter. In such a scenario, the device issues itself the
SIP response code 408 (Request Timeout). Alternative routing is only done if you have
configured this response code in the SBC Alternative Routing Reasons table.
User's Manual 546
Mediant 3000
Document #: LTRT-89738