[cisco-voip] What does it mean if Cisco sends ISDN 0/-1:D:0 in NAS-Port-Name attribute?

[Andrew Pogrebennyk]

Hello,
On Cisco AS5350 there are total 4 ports from 3/0:D to 3/3:D. But 
sometimes Cisco sends 'ISDN 0/-1:D:0' in NAS-Port-Name attribute. It 
seems there are more such calls at the time when there is more traffic. 
At such times there is smaller number of active calls than number of 
call attempts like for some reason some call attempts hang. E.g. in dead 
night I can see 0 active calls and 4-5 call attempts. I resolve it by 
shutting down/up E1 controller from time to time. I wonder what could be 
the reason? I'm using c5350-is-mz.123-1a.bin IOS.
Thanks,

-- 
Sincerely,
Andrew Pogrebennyk