Inbound Calls - Dialogic Vision CX Video Administration Manual

Dialogic® Vision™ CX Video Gateway Administration Manual

Inbound calls

An inbound call (SIP to PSTN) is initiated through a SIP INVITE. The SDP
Offer/Answer model (RFC 3264) is used for media negotiation. The INVITE usually
contains the offer, and the 200 OK response contains the answer SDP.
The following table lists the possible responses to the SIP INVITE:
Response
200 OK
480 Temporarily Unavailable
503 Service Unavailable
By default, the CX Video Gateway handles incoming DTMF content in the following
manner:
If RFC 2833 is negotiated, then the gateway obtains the DTMF tone and
•
duration through an RFC 2833 DTMF event.
If RFC 2833 is not negotiated, then the gateway obtains the DTMF tone and
•
duration from the body of the SIP INFO message.
If the joined connection is a SIP connection, then audio transcoding automatically
occurs between the two endpoints, when required.
Dialogic
Description
Success.
Call not authorized.
No channels available to take call.
SIP interface
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