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This feature allows the IMG to respond to the 3XX class of SIP messages returned from a redirect server. 3xx responses provide information about a user's 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 maximum number of redirects is 10.
The same IP Profile is used for all attempts.
Once a contact has responded with a 180 Ringing or 183, the IMG will not make any more redirect attempts
Not Supported
Simultaneous redirects
Redirection to another Channel Group
3xx Responses for Registration Requests
380 Responses (they will be mapped to 410 Gone error code and released)
305 Response (they will be mapped to 410 Gone error code and released)
Location changes are not saved internally
The IMG cannot be redirected back to the PSTN
3XX Response Mapping
If this feature is not enabled, the IMG will map the 3xx responses to 4xx responses, as shown below:
Redirection (3xx) Response | Maps to 4xx (client error) response |
300 Multiple choices | 410 Gone |
301 Moved Permanently | 410 Gone |
302 Moved Temporarily | 480 Temporarily Unavailable |
305 Use Proxy | 410 Gone |
380 Alternative Service | 410 Gone |
any other 3xx response | 410 Gone |
Example Call Flow
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Related topics
IMG 1010 - Supported 3xx Redirect Responses
IMG 1010 - SIP Profile - 10.5.3
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