I was doing some testing with Snom phones to try and get the phone to register to two Edge Proxies at once. With Snom you are able to configure multiple outbound proxies for a user. Snom sends a REGISTER to the first proxy without issue but the 200 response back from OpenSIPS doesn't have the following header
When I read RFC 5626 I see the following is required The UAC examines successful registration responses for the *presence* * of an outbound option-tag in a Require header field value*. Presence of this option-tag indicates that the registrar is compliant with this specification, and that any edge proxies which needed to participate are also compliant. If the registrar did not support Jennings, et al. Standards Track [Page 15] ------------------------------ <https://tools.ietf.org/html/rfc5626#page-16> RFC 5626 <https://tools.ietf.org/html/rfc5626> Client-Initiated Connections in SIP October 2009 outbound, the UA has potentially registered an un-routable contact. It is the responsibility of the UA to remove any inappropriate Contacts. So the issue I see with the Snom phone is that it registers with the first Edge Proxy but doesn't send a REGISTER request to the second Edge Proxy. I figure this is because it is not seeing the "Require: outbound" in the 200 response.
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