Bearer Capability
Bearer Capability in telecommunications is one of the Information Elements (fields) of the Q.931 SETUP message. It is used by the calling party to specify the type of B channel being requested.
Description
For example, if a Bearer Capability of Speech is specified, the network is free to select a set of facilities that can provide this service (including, in this case, analogue trunks and routes involving echo cancellers or DCME).
If, on the other hand, a Bearer Capability of Unrestricted Digital Information{{Cite web|url=https://www.ccexpert.us/telecommunications/bearer-capability.html|title=Bearer Capability - Telecommunications|first=Stephen|last=Richardson|date=September 16, 2023|website=Cisco Certified Expert}} is specified, the network is required to set up the call using only end-to-end digital facilities (without the use of robbed-bit signaling, echo cancellers, DCME nor A-law to mu-law conversion), or reject the call if no end-to-end digital circuit is available.
The Bearer Capability is augmented by the Higher Layer Compatibility (HLC) Information Element{{Cite web|url=https://www.etsi.org/deliver/etsi_etr/001_099/018/04_60/etr_018e04p.pdf|title=ETR 018 by European Telecommunications Standards Institute 1995}} (another field in the Q.931 SETUP message), which informs the network of the intended use of the channel by the caller.
References
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External links
- [http://www.itu.int/rec/T-REC-Q.931/en/ ITU-T Recommendation Q.931] paragraph 4.5.5.
Category:Integrated Services Digital Network
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