Branch Office Calls on Bridge

[DrainBamaged]

Here is the scenario on how our offices are connected with 3cx bridges.

Branch Office (22xxx) <-> Head Office (21xxx) <-> Overseas Office (23xxx)

To call the branch office from head office we dial 22xxx, the 22 is stripped off with an outbound rule and call is sent to the branch office PBX successfully. On the receiving phone we see caller ID of "21xxx," the calling extension, which is fine as that's the number to dial to return the call.

The overseas office and the branch office are not directly connected and won't be. So calls need to go through head office. If 22xxx is dialed in the overseas office, it goes to head office, but no digits are stripped in the outbound rule and the full 22xxx is sent to head office so it can be routed to the branch office. Head office gets the call, strips the 22 on it's outbound rule and sends the call on. However, the caller ID seen on the receiving phone is 2123xxx

It should just be 23xxx of the dialing person. Where is the 21 coming from and how do I suppress it?

PS all calls work fine. It's just the caller ID that's wonky.

 

[AWS2P]

have you check the logs info?
what is the rule applied to calls from overseas to head office ?
what is the rule applied to calls from head to Branch office ?

Could be a rule error don't removing 21 prefix between head to branch office ?

 

[leejor]

The overseas office and the branch office are not directly connected and won't be.

What is the reason for not adding a bridge trunk between these offices, there would be no ongoing cost. Caller ID, when tandeming through a bridge trunk, has had issues for a long time.

 

[JohnS_3CX]

So when the call from overseas arrives at head office via the bridge, the prefix is assigned. Then the call is passed on to branch office via its bridge, hence the next prefix is assigned. This is a normal side-effect (yet not the intended way of usage) but unless you bridge overseas with branch, then you will be using 2 simultaneous calls from the head office for no reason, and the caller ID will be wrong so the recipient of the call will not be able to dial back the caller.

This is not how bridges were designed to work, the idea is that you can have meshed bridges for a 3 site setup like yours:



Please refer to this material here for a step by step explanation:
https://www.3cx.com/3cxacademy/videos/advanced/3cx-bridge-configuration/