thanks for your response,
they sent me this doc
thanks
Configuration of SIP phones
These settings do not apply for the Sonetel Windows client nor for the Sonetel Android app but only for 3rd party SIP phones. You can find specific instructions for many popular SIP phones here.
Enter the following information into your SIP-phone.
SIP server or SIP Proxy sip.sonetel.com
SIP User ID and Authenticate ID The first part of your email address.
For example "joe" in "
joe@company.com"
Domain/realm The second part of your email address.
For example "company.com" in "
joe@company.com".
STUN server stun.sonetel.com
Does your phone have a field for Outbound proxy?
If your phone has a field for Outbound proxy do like this instead:
1.Enter sip.sonetel.com as Outbound proxy
2.Enter The second part of your email address as SIP proxy.
Other recommendations
1.Use ICE for the firewall detection, if available
2.The SIP registrar has the same address the same as SIP server.
3.The IP port for SIP proxy is 5060 (according to standard).
4.Transport type is UDP.