Does SIP RFC allows multiple endpoints registered to one account?

Question

Sorry, if this is a repeated question.

I am using FreeSwitch which uses Nokia Sofia SIP stack. It allows me to register multiple endpoints using one user credentials. e.g. I can log in using user id 1000 with multiple devices.

I want to know whether SIP RFC 3261 allows multiple endpoints registered to one account or not?

Update me about this.

Answer 1

RFC 3261 States - 10.2.1 Adding Bindings

Once a client has established bindings at a registrar, it MAY send subsequent registrations containing new bindings or modifications to existing bindings as necessary. The 2xx response to the REGISTER request will contain, in a Contact header field, a complete list of bindings that have been registered for this address-of-record at this registrar.

These additional bindings allow users to register as many endpoints to their registration with the REGISTRAR.

Answer 2

Yes, RFC 3261 allows multiple endpoints registered to one account.

For instance, you can have three SIP phones, one running at work, one at home, and one on your smartphone. Then you register all SIP phones using the same account, but with different Contact header addresses. Each Contact can have a "q" parameter, which indicates a preference level. So when a call arrives in PBX, it can send the INVITE to the most preferable contact (highest "q" parameter), and if this contact does not answer, the PBX can try the contact with the second highest "q" parameter, and so on.

RFC 3261: 10.2.1.2 Preferences among Contact Addresses If more than one Contact is sent in a REGISTER request, the registering UA intends to associate all of the URIs in these Contact header field values with the address-of-record present in the To field. This list can be prioritized with the "q" parameter in the Contact header field. The "q" parameter indicates a relative preference for the particular Contact header field value compared to other bindings for this address-of-record.