Welcome Trunk Problem on Outgoing Call Double 183 Session Progress

[atik]

We have new Voip Provider "Welcome" on some customer with some problem,
many problem resolved, but one problem STILL.

When Outgoing Call Provider reply me:
SIP 100 Trying
SIP 183 Session Progress
SIP/SDP 183 Session Progress,

all other provider send us after 100 Trying, 183 SIP/SDP with Call result

with "Welcome Provider" Receiving Immediatly Only "SIP 183 Session Progress", and 3CX send Fake RING to Phone, not wait Call Result received with SIP/SDP a few second later

i don't know how to tell to 3CX to wait SIP/SDP signal and not send Fake Ring to Phone.

Anyone Help ME ?

Thanks - Roberto - Atik Srl

 

[YiannisH_3CX]

Hello @atik

I would recommend using a supported provider to avoid these kind of issues. You can see a list with supported providers here.
There is no way to change the behaviour of the PBX on this matter. Since the PBX receives a 183 Session Progress it will send Ringing to the endpoint.