[Help] Dial(SIP/user:passwd@0088216xxxx@

I have php script.
This script generates call file in spool/asterisk/outgoing
In call file there is dial string.
If dial string is SIP/phone@provider - everything is perfect, where provider is section from sip conf.
If I will try to prepare dial string, using username and password - I have no chaqnce.
When I try SIP/user:passwd@0088216xxxx@ - no such server 0088216xxx@, if I try SIP/user:passwd:0088216xxxx@ - Failed to authenticate on INVITE to user.

Any sugestions are wellcome :cry: