Based on the capabilities of the SIP provider, a BYOC Premises Edge requires or does not require a SIP proxy between a premises-based Edge and a SIP provider.
A premises-based Edge does not require a SIP Proxy if the SIP provider meets both of the following requirements:
For inbound calls, the carrier distributes calls among the Edges. For outbound calls, Edges load balance with randomization.
An Edge requires a SIP Proxy for either of the below situations: