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Showing posts from November, 2011

Caller ID Display over ISDN PRI - PART 1

I thought to divide this topic into two blogs to make it more clear. First we will understand Caller ID Display from ISDN side, then we will map it to call control protocols (MGCP/SIP/H323).
Advanced ISDN IEs Configuration (Facility & Display)
Display IE is used mainly to provide the calling name over PRI Trunk. It can be sent in SETUP, ALERTING, or CALLPROC messages. For example,
Nov 23 12:36:11.610: ISDN Se0/2/0:23 Q931: TX -> SETUP pd = 8  callref = 0x00A3         Bearer Capability i = 0x8090A2                 Standard = CCITT                 Transfer Capability = Speech                  Transfer Mode = Circuit                 Transfer Rate = 64 kbit/s         Channel ID i = 0xA98383                 Exclusive, Channel 3         Progress Ind i = 0x8183 - Origination address is non-ISDN  Display i = 'user01'         Calling Party Number i = 0x4180, '2023001'                 Plan:ISDN, Type:Subscriber(local)         Called Party Number i = 0xC1, '3023001'   …