[asterisk-users] PRI debuging shows 'Ext: 0' (Was: Outgoing PRI CID?)

[Turbo Fredriksson]

Quoting mail-lists <mail-lists at peachnet.com>:

> Turbo Fredriksson wrote:
>> We have now got our new PRI line (10 channels, 100 numbers) connected
>> and everything is working except the outgoing caller ID. Whatever
>> SIP phone I'm using, the CID that's shown is the very first number...

Enabling PRI debugging shows the following:

----- s n i p -----
1 > [6c 05 21 81 35 32 38]
1 > Calling Number (len= 7) [ Ext: 0  TON: National Number (2)  NPI: ISDN/Telephony Numbering Plan (E.164/E.163) (1)
1 >                           Presentation: Presentation permitted, user number passed network screening (1)  '528' ]
----- s n i p -----

I _assume_ (maybe wrongly!) that this '0' is the ${CALLINGPRES}
variable. If I print this just before the Dial(), this is indeed
zero...

But it seems to be read-only... Any other way to send the extension
down to the other end of the PRI line?