SIP client registration thru SBC and ECB
Hi,
I have to setup the following: SIP client (internet) - SBC - ECB - IPPBX1(registrar)
ECB will not be the registrar, but has to forward the registrations to IPPBX1 (registrar). Several other IPPBX's will be connected via SIP trunk to ECB.
I want to make sure that the design and the call flows are defined properly before starting configuring.
For client registration, the SBC will have the registration cache. What about ECB? What should be the contact sent to IPPBX1 upon registrations? SBC or ECB? What will be the call flow on calls to the SIP client?
On a call from the registered client, the invite should go to IPPBX1, as features will apply. How is this achieved?