[OpenSIPStack] OpenSBC: passthrough SIP registration to external registrar

[busybox b. <bu...@ya...>]

Hello overyone.

I'm planning to use the OpenSBC as a transparent SIP proxy to another soft switch.

So, I've got a soft switch (SS), which contans user accounts and performs users' calls processing.

But between users' soft phones and SS there is OpenSBC. So, I need the OpenSBC to passtrough transparently users' phones registrations to the SS and the same about users' calls.

Registration example:

SoftPhone ---> OpenSBC ---> SS

1. SoftPhone sends SIP registration to the OpenSBC
2. The OpenSBC sends this registration transparently to the the SS
3. SS confirms the registration of the SoftPhone

Call processing example:

SoftPhone1 ---> OpenSBC ---> SS ---> OpenSBC ---> SoftPhone2

1. SoftPhone sends SIP INVITE to the OpenSBC
2. The OpenSBC sends this INVITE transparently to the the SS
3. SS performs call processing and routing and sends SIP INVITE to the SoftPhone2 through the OpenSBC transparently


Well. The question is HOW to configure OpenSBC to process registrations and calls according to the schemes above???
Is it actually possible or I need some extra coding of OpenSBC?

Any info appreciated