Q.763 id | Q.931 id | | | | 8 7 6 5 4 3 2 1 1 3 1 ext b b a a a a a 2 4 1 ext d d c c c c c 2a 4.1 1 ext e e e e e e e 3 5 0/1 ext 0 1 f f f f f 4 6 1 ext 1 0 p2 p2 p2 p2 p2 5 7 1 ext 1 1 p3 p3 p3 p3 p3NOTE 1 - Octet 2a is required if octet 2 indicates multirate (64 kbit/s base rate); otherwise, it shall not be present.
NOTE 2 - Octets 3, 4, 5 or any combination of these octets may be omitted. Octet 3 may be extended as described in Recommendation Q.931.
The codes to be used in the subfields of the user service information parameter field is defined in the Bearer capability information element in Recommendation Q.931.