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CHAPTER 6 NDA-24305
Page 278
Revision 1.0
IS-11572 (LAYER 3 SPECIFICATIONS FOR INTER-PBX SIGNALING PROTOCOL)
2. Bearer Capability
• The transfer rate is 64 kbps/384 kbps/1,536 kbps/64 kbps × n (since Release 4) only.
• This feature provides the following Bearer Capabilities:
– Speech
– Unrestricted Digital Information
– Restricted Digital Information (only in case of interworking)
– 3.1 kHz audio
– Unrestricted Multi-Rate
• At terminating PBX, received bearer capabilities are converted as shown below.
Speech, 3.1 kHz audio, 7 kHz audio → Speech
Unrestricted/Restricted Digital Information, Video → Unrestricted Digital Information
• Transparency of Bearer Capability when interworking with the C.O./Tie Line is shown in Table 6-1.
Table 6-1 Transparency of Bearer Capability When Interworking with C.O./Tie Line
BEARER CAPABILITY
SPEECH
3.1k
AUDIO
7.1k AUDIO
UNRESTRICTED
DIGITAL
RESTRICTED
DIGITAL
VIDEO
INTERWORKING
C.O. Line
ISDN → IS-11572 – –
IS-11572 → ISDN
Converted to
3.1k audio
Converted to
Unrestricted digital
Analog C.O. → IS-11572 – – – – –
IS-11572 → Analog C.O. – – – – – –
Tie Line
CCIS → IS-11572 – – –
IS-11572 → CCIS
Converted to
3.1k audio
Converted to
Unrestricted digital
Converted to
Unrestricted digital
ACIS → IS-11572 – – – – –
IS-11572 → ACIS – – – – – –
: Transparent
: Not Available
–