BCAP

Bearer Capability

Format

Function

The parameter states the bearer capability of a route. The bearer capability of a route is what type of calls (regarding bandwidth) that are allowed to use a route. The bearer capability of a route is only used for outgoing calls. All outgoing calls have a bearer capability request. This bearer capability request is checked against the bearer capability of the possible route choices. Only routes supporting the bearer capability requested for the call can be selected.

64 kbit/s Unrestricted means that the whole bandwidth is used. 64 kbit/s Restricted means that not the whole bandwidth is used. 3.1 kHz audio. Telephony and/or data calls with modem. SPEECH. Telephony calls only. 7 kHz audio (UDI-TA) is used for video-telephony and for high quality ISDN telephony. 16 kbit/s Unrestricted means that 16 kbit/s of the whole bandwidth (64 kbit/s) is used.

If the parameter is omitted, bearer capability SPEECH and 3.1 kHz audio are assumed as default for the route. This means that only calls with bearer capability request Speech or 3.1 kHz audio are allowed to use the route.

Note: Bearer capability 64 kbit/s Unrestricted shall be set if a SIP route shall support MSRP.

Note: The parameter has no relevance whatsoever for incoming calls on the route. For the signaling system DPNSS, DASS, ISDN, H.323 and CCSS7 a bearer capability request (to be used for further routing of the call) will be received as a part of the incoming call. For other signaling systems (CAS) no bearer capability request is received for incoming calls. The bearer capability request SPEECH will be assigned to these calls. If another value than the assigned one is required the assigned bearer capability request SPEECH must be substituted with the required value, see the operational directions for NUMBER CONVERSION AND BEARER CAPABILITY SUBSTITUTION.

Example

The route shall have the following bearer capability:

BCAP = 101100