The SBC supports implicit registration of SIP endpoints. More specifically, the SBC supports a SIP registrar returning a set of associated URIs that are implicitly registered in response to a REGISTER message for a single Address of Record (AoR). The 200 response to the REGISTER request identifies each implicitly registered URI in a P-Associated-URI header.

P-Associated-URI headers in the 200 response are passed transparently by the SBC. Up to 20 SIP/Tel URIs are supported in a P-Associated-URI header for a single 200 OK response.

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