I'm wondering if anyone has ever experienced the following or has any idea what might be causing this. I have a 2821 with 2 PRI trunks into a Nortel 81c pbx. I'm using Q.sig as the switch type. The ISDN layers are up and operational. The 81c is connected to the PSTN with multiple PRIs. Here is the configuration of the D channel:
no ip address
isdn switch-type primary-qsig
isdn incoming-voice voice
isdn supp-service name calling profile Network-Extension operation-value-tag local
isdn outgoing ie facility
no isdn outgoing ie notify-indicator
isdn outgoing display-ie
isdn outgoing ie caller-number
isdn outgoing ie called-number
isdn incoming ie channel-id accept-qsig-variant
no cdp enable
The problem is that I am able to successfully place a call to some 1800 numbers, but not others, including 1877 and 1866. Also, none of my 7 digit dialing is working - 9NXXXXXX. When a non-working 800 number is dialed or 7 digit #, the phone just rings and the eventually I get a busy and it hangs up. These non-working numbers are able to be dialed from non-Voip phones connected to the 81c. It seems very odd that one 800 number would work, and one wouldn't.
I've debugged isdn q.931 events but that hasn't led to any clues...it appears that the call is handed off to the 81c successfully, then a disconnect is eventually received after the ringing has stopped.