I'm creating a phonenumber via API to make a SIP call. Everything works well as long as I dont set any authentication to my Phone Number. When I set username/password I'm unable to make it work and it always rejects my authentication credentials. Is there something else I must take in account? please take note that its a SIP call. Thanks.

Hey @jlbc.zasylogic can you share the call id and PCAP file?