414 V7122 GatewayUser GuideSIP ResponsesThe 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 Responses1xx Response – Information ResponsesTable 87 1xx SIP Responses1xx Response Supported Comments100 Trying Yes The SIP gateway generates this response upon receiving ofProceeding message from ISDN or immediately after placing a call forCAS signaling.180 Ringing Yes The SIP gateway generates this response for an incoming INVITEmessage. On receiving this response, the gateway waits for a 200 OKresponse.181 Call is beingforwardedYes The SIP gateway does not generate these responses. However, thegateway does receive them. The gateway processes these responsesthe 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 waitingRingback tone to TEL side.183 SessionProgressYes The SIP gateway generates this response if Early Media feature isenabled and if the gateway plays a Ringback tone to IP2xx Response – Successful ResponsesTable 88 2xx SIP Responses2xx Response Supported Comments200 OK Yes202 Accepted Yes
