Multiple RTP Media Streams per Call Session

The device's SBC application supports multiple RTP media streams per SBC call session. It supports the negotiation of up to five media streams ('m=' line) in the SDP offer/answer model per session. The media can include a combination of any of the following types:

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Audio, indicated in the SDP as 'm=audio'

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Video, indicated in the SDP as 'm=video'

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Text, indicated in the SDP as 'm=text'

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Fax, indicated in the SDP as 'm=image'

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Binary Floor Control Protocol (BFCP), indicated in the SDP as 'm=application <port> UDP/BFCP'

Therefore, the device supports transcoding of various attributes in the SDP offer-answer (e.g., codec, port, and packetization time) per media type. If the device is unable to perform transcoding (e.g., doesn't support the coder), it relays the SBC dialog transparently.