The Bearer capability information element shall be encoded as in 4.5.5 (Bearer capability) with the following exceptions:
1) Octet 3 shall be coded unrestricted digital information.
2) Octet 4 shall be coded circuit-mode and the information transfer rate (bits 5 to 1) shall be encoded:
Bits |
|
5 4 3 2 1 |
Circuit-mode |
1 1 0 0 0 |
Multirate (64 kbit/s base rare) |
3) Octet 4.1 (Rate multiplier) shall be included. Bit 8 is for extension and set to 1. Bits 7-1 contain the binary coding of the multiplier that applies to the multirate code point contained in the information transfer rate subfield. Bit 1 is least significant. The multiplier value range is 2-30, all other values are reserved. Octet 4.1 shall be included if and only if the transfer rate is coded for multirate.
Note - When the information transfer rate is 384kbit/s, 1536 kbit/s, or 1920 kbit/s the information transfer rate in the Bearer capability information element may also be coded as 384 kbit/s (10011), 1536 kbit/s (10101), or 1920 kbit/s (10111) respectively instead of using the multirate (64kbit/s base rate) code point and the associated rate multiplier field.