Since 2004 asterisk/libpri have been able to receive the Calling Sub Address in the ISDN setup message, and the dialplan was able to use it if required. It's support is limited to only NSAP, not BCD or user formatted. At the time 25/06/04 the questioned was asked, wouldn't it be a good idea to be able to transmit it as well, but that never got implemented, as it wasn't required at the time. Further to this, there is also Called Sub Address that allows you to dial a particular terminal device at an ISDN number, these days isn't a terminal device a users extension. Finishing off the limited support for SUBADDR, if your keen is at <https://issues.asterisk.org/view.php?id=15604> https://issues.asterisk.org/view.php?id=15604, this adds CallingSubAaddress (Transmit) and CalledSubAddress (Transmit and Receive), still only in NSAP, not User formatted. This code may not ever make it into trunk, but if you find this code useful please leave a comment on the mantis bug. This has been tested with the exisiting 1.4 -1.6.2 branches, and is in use at 3 PRI/BRI sites with asterisk 1.6.1. The Digium team have other good ideas for 1.6.3 which will as I understand it support SUBADDR over any transport, but it will be a while before most of us are happy using the latest offering in production. Alec Davis
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