Managing the CX Video Gateway
Dialogic® Vision™ CX Video Gateway Administration Manual
Video call completion to voice service
The Video Call Completion to Voice (VCCV) service allows a 3G video call to be
connected as a voice-only call when the called party is not able to receive video calls.
This service may be useful in the following call scenarios:
•
Called party is not a 3G subscriber.
•
Called party is a 3G subscriber but is out of 3G coverage.
•
Called party is a 3G subscriber but is in a busy, no answer, or switched-off
condition.
•
Called party is roaming in a network that does not support video calls.
•
Called party has no subscription to video calls.
The service terminates the initial video call and starts a separate audio call to the
called party. During the audio conversation, the service streams application-defined
video content to the 3G calling party.
VCCV provides early media support. If early media is enabled, media begins to flow
in both directions before the 3G video call is connected. In an SS7 network, this
means that the 3G-324M negotiation starts after the address complete message
(ACM) rather than the answer message (ANM) is received from the Call Server.
Note:
The VCCV service requires Dialogic® Vision™
VX Integrated Media Platform
licenses.
The following topics provide more information about VCCV:
•
Call logic
•
Using the service
•
Adding the gateway.ccxml application
•
Enabling the Call Server for early media
•
Creating a gateway routing table entry
•
Examples for VCCV
Call logic
At a high level, the call logic for Video Call Completion to Voice (VCCV) is as follows:
1.
A user makes a video call from a 3G handset to a party that cannot receive
video calls.
2.
The network determines that bearer capability is not supported and redirects
the call to the Vision™ Server.
3.
If the gateway routing table entry specifies VCCV, the Vision™ Server then
terminates the initial video call and places an audio call to the called party.
4.
Without the early media option, after the called party answers the call, an
audio announcement is played to the called party while 3G negotiation takes
place. The call is typically connected after the audio announcement is
complete. In some cases, depending on network traffic and when 3G
negotiation is complete, the call may take a little longer to be connected.
5.
If the early media option is enabled, the Vision™ Server begins to stream a
video ringback file while the called party’s handset is ringing. When the called
party answers the phone, the gateway stops the video ringback file, and
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