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Configuring multimedia (Video and Audio) is similar to configuring a SIP to SIP transcoding call. When configuring the IMG 2020 to process a multimedia call, the SIP stack, SIP channel groups, SIP Video Profiles, and IP facilities all need to be configured. The difference between configuring a SIP to SIP audio call and a SIP to SIP multimedia call is the when configuring the IP Profiles. When configuring a SIP to SIP audio call, there are a set of audio codecs to choose from under the IP profiles object. When configuring a SIP to SIP multimedia call there are video and audio codecs to choose from. Follow the procedure below to configure the IMG 2020 to accept an incoming multimedia call using the H.264 video codec and G.711 ulaw audio codec and transcoding the video to MPEG_4 video and G.729 audio codec to send out the outgoing leg.
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Before proceeding, verify that the Basic Configurations topic has been completed. The Basic Configurations topic sets up objects such as VoIP Interfaces and IP Bearer ports needed prior to starting the Configuring SIP procedure. When creating the Physical Node object, configure the Media Mode for either 25% or 100% Transcoding. Transcoding from H.264 to MPEG-4 is described in this procedure. |
Procedure
For the IMG 2020 to be able to make a video call, the IP resources for multimedia must be allocated. The number of IP resources available and the number of resources to allocate is dependent on the following:
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Right click on the IP Profile object and select New Video Profile. In the ID field, either accept the default ID or select one of the other ID's from the drop down menu in this field. Refer to the Video Profile topic for more information on this topic.
In the Codec Type field select from the drop down menu one of the supported codecs. In this procedure H264 was selected.
Right click on the Video Profile object and selectNew H264 Codec. This is the object where the individual supported parameters for that particular codec are configured. Refer to the H.264 Codec topic for more information on configuring the individual fields in this object.
Right click on the IP Profile object again and select New Video Profile. In the ID field accept the default or select one of the other ID's from the drop down menu again.
In the Codec Type field select MPEG_4 since the procedure is transcoding H.264 to MPEG_4.
Right click on the MPEG_4 Video Profile just created and select New MPEG_4 Codec. Again, this is the object where the individual supported parameters for that particular codec are configured. Refer to the MPEG_4 Codec topic for more information on this object.
Click back on the Profiles object. The Profiles object will have a yellow exclamation point for the icon indicating the configuration has not yet been sent to the IMG 2020. Click on the Download Profiles button in the object and the configuration will be sent to the IMG 2020.
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