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V7122 GatewayUser Guide
SIP Responses
The following SIP responses are supported by the gateway:
1xx Response - Information Responses
2xx Response - Successful Responses
3xx Response - Redirection Responses
4xx Response - Client Failure Responses
5xx Response - Server Failure Responses
6xx Response - Global Responses
1xx Response – Information Responses
Table 87
1xx SIP Responses
1xx Response
Supported
Comments
100
Trying
Yes
The SIP gateway generates this response upon receiving of
Proceeding message from ISDN or immediately after placing a call for
CAS signaling.
180
Ringing
Yes
The SIP gateway generates this response for an incoming INVITE
message. On receiving this response, the gateway waits for a 200 OK
response.
181
Call is being
forwarded
Yes
The SIP gateway does not generate these responses. However, the
gateway does receive them. The gateway processes these responses
the same way that it processes the 100 Trying response.
182
Queued
Yes
The SIP gateway generates this response in Call Waiting service.
When SIP gateway receives a 182 response, it plays a special waiting
Ringback tone to TEL side.
183
Session
Progress
Yes
The SIP gateway generates this response if Early Media feature is
enabled and if the gateway plays a Ringback tone to IP
2xx Response – Successful Responses
Table 88
2xx SIP Responses
2xx Response
Supported
Comments
200 OK
Yes
202 Accepted
Yes
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