Working sip trunk config for O2 Telefonica?

[BennoB]

Hello,
is there anybody with a working config for sip trunk O2 Telefonica? I have configured a generic with my credentials and the line will be registred but no outgoing sip call is possible. I already changed the DNS server to O2. Can somebody help?

best regards
BennoB

 

[YiannisH_3CX]

Hello @BennoB

I would recommend using a supported provider to avoid all the guessing and manual configuration. If you still want to use O2 then you will need to ask them how they want the calls structured and adjust the outbound parameters of the trunk manually to match their requirements.