[cisco-voip] Collect Call is not accept

[Robert Kulagowski]

mianni at bovespa.com.br wrote:
> I have a CCM 4.1.3 and my users can´t receive a collect call.   The phone
> rings but when they hang off , the call is droped.
> 
>       PSTN ==> PBX ==> GW Router 2800 ==> CCM ==> phones
> 
> Someone have a idea what is happening or why ???

# debug isdn q931
# term mon

Is that diagram accurate though?  You're not connected directly to the 
PSTN?  There's another PBX in front of you?