Hello all!
It worked. Now, I'm able to dial users from/ to both systems (IP500/ SE).
But I'm curious though. If I simply added the ARS rule. It caused errors, when dialing the last 4 digits from SE to Ip500 and vice versa. On both devices, the call always ended up catching the carrier SIP trunk ARS config.
So, I created short codes on both devices, delimitating the extension length.
On the ICR I added a (.) for destination and for fallback, empty. That procedure ignored ARS rules and ended up establishing the call initiation.
There only 2 things that are making me curious:
1) At the moment, both I/O calls are correctly identified on the SE (user name on the top, user extension number on the botton), but I cannot call back from the registered missed/ received calls.
2) On the IP500, however, only User name is displayed on the incoming Calls from the SE. If I check for received/ missed calls I get User name/ User name on the phone screen. For outgoing calls, I get "unknown" tag on the botton of the phone screen.
On the Ip500 I use one H323 9611 phone. I have just CRAFTed it and changed its SIG to SIP, but yet nothing changes.
On the SE, on both h323 9611 and on SIP J179 phones, I'm able to see User number/ name for I/O calls.