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The SIP Redirect feature allows the IMG 2020 to respond to the 3xx class of SIP messages returned from a redirect server. The 3xx responses provide information about a users new location, or alternative services that may be able to satisfy the call. This feature is based on RFC 3261 section 8.1.3.4 and RFC 2543.
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The SIP Redirect feature is enabled by default but can be disabled through the 3xx Redirect Support field in the SIP Profile - SGP Web GUI Page.
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The IMG 2020 can also act as the Redirect Server. Refer to the topic for information on this |
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The maximum number of redirects supported is ten.
The same IP Profile is used for all attempts.
Once a contact has responded with a 180 Ringing or 183, the IMG 2020 will not make any more redirect attempts.
Simultaneous redirects are not supported.
Redirection to another Channel Group is not supported accept if using IMG 1010 - SIP Redirect IMG Initiated 302.
3xx Responses for Registration Requests is not supported.
380 Responses will be mapped to 410 Gone error code and released.
305 Response will be mapped to 410 Gone error code and released.
Location changes are not saved internally.
The IMG 2020 cannot be redirected back to the PSTN