[cisco-voip] IP phone to CCM to GW to PSTN (one ring then busy tone)

[Tamer Mohamed Bayomy]

Dear All,

 

Kindly I need help as I'm having very weird problem which is as follows:

 

At Site 1:

 

We have IP Phones registered in Site 1 CCM, 

 

At Site 2:

 

We have Cisco voice gateway which can dial to the PSTN

 

The problem:

 

When I dial from the IP phones any number behind Site 2 PSTN the call
rings only one time and then send me busy tone.

 

This case is casing business pain and I can not find any clue, I need
help..

 

Regards..  

 

 

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