Passthrough number forwarding

[qss1]

Hi There

We have an interesting issue I cannot see a solution for so any ideas are welcome.

We have setup a ring group to forward to an external number if not the phones are not answered
We have added an outbound rule for this and calls route to the destination
When the providers SIP settings are set to write the trunk number the destination recipient sees the SIP trunk number only
Change the providers SIP trunk is set to "pass through" this makes the calls received at the destination as "Anonymous"

To get the original caller ID to pass to the forwarded call we have set the 3cx SIP trunk outbound settings as
Remote Party ID - Calling Party : Display Name = Original Caller number will be sent
Remote Party ID - Calling Party : User Part = Original Caller number will be sent

When calling any destination from teh PBX the SIP number is presented as expected, its only the forwarded number that seems to be stripped out.
I cannot see where this is getting stripped out.

I have checked the logs on the PBX and can see the forward destination sees an anonymous call when forwarding but not when dialling from the source PBX

Thanks for your assistance

 

[leejor]

To get the original caller ID to pass to the forwarded call we have set the 3cx SIP trunk outbound settings as
Remote Party ID - Calling Party : Display Name = Original Caller number will be sent
Remote Party ID - Calling Party : User Part = Original Caller number will be sent

This statement seems to indicate that the original number is being passed to the called number, is that correct? What provider are you using? Some one may have experienced the same issue and have some suggestions as to what settings need to be changed.

 

[YiannisH_3CX]

Hi @qss1

As far as i understand you are trying to present the original callers ID to a forwarded call? If so then you need to speak with your provider. Ask them if this is supported, as many providers do not allow you to spoof numbers and if this is supported what are the settings you should use. Then adjust your outbound parameters accordingly.

 

[qss1]

Thank you for your input, we use voiceflex and have other clients that use passthrough. Its an option that you can toggle on or off.
When its off the PBX delivers the CLI recorded in the 3cx SIP trunk settings for outgoing calls. It is just forwarded calls that do not present correclty.
The receiving PBX has other systems hitting it with passthrough or forwarded numbers that work correctly which is why we have been focused on the particualr sending PBX that is not working properly.