Routing between SIP Servers

[gemini]

1. Brekeke Product Name and version:
SIP 1.5

2. Java version:
??

3. OS type and the version:
Windows Server 2003

4. UA (phone), gateway or other hardware/software involved:
Brekeke Sip 1.5

5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/networkpatterns.html :
n/a

6. Your problem:

need to route voice mail requests from external sip to internal sip and return.

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I have an external SIP for remote users, configured to only call local extensions (can't access gateway). I have internal SIP for local users, configured with normal call routing.

I need for internal users to leave VM for external users, I need external users to dial 4xxxx and get the VM left.

The jist I get, since users are registered to different SIP servers this wont work.

it there a better way? a secure way to allow remote users to register to the internal SIP server and not allow access to gateway.
I wouldn't want internal externsions to register from remote locations to protect access to the gateway.

[gemini]

in brekeke's infinite wisdom, they added a real nice feature called Upper/Though Registration, which does exactly what I want. It makes a SIP server act as a proxy for a "higher authority".

well done. see page 5 of your Admin guide for more detail.