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NEC SV9100 CCIS with IP phones. Netlink not an option at this point in time.
3 system connected together by CCIS. All the systems have digital phones and analog lines. System 1 has all the IP phones attached to it with sets placed on each site. Users log onto the IP phones depending where they are for the day. Users want to be able to answer incoming calls when they hear the analog trunks ringing when they are at system 2 or 3. Is there a way to setup the systems so this can be done by codes or buttons?

setup virtuals in the main site, and have them appear as virtual keys on the sites you want the calls to ring.

This would involved separate numbering plans for extensions at each site thou

Thank you. Will try that.

Did not work. Our techs notes are below.
We have tried the setup. We have 3 nodes, node 1 has 2xx, node 2 has 3xx and node 3 has 4xx extension numbering and are using F-Routes. IP phones reside in node 1. We have setup virtual 450 in node 3 to ring incoming analog calls in mode 1. Program 215 in node 1 with virtual 450 (only able to in WebPro because it is not a valid virtual in node 1 because of F-Route). When we call analog lines or dial 450 directly from node 3 it does not ring the phone. What would we be missing to make this work?
Have tried forwarding virtual(450) from node 3 to a virtual(250) in node 1 and on an internal call it will ring but when tried on an analog line and incoming ring group the forwarding virtual will not ring. This is a limitation on the incoming ring groups where it will not accept forwarding, I believe.

Guess R4 is a must. New feature "DDI to service code" will be available. The question is whether CCIS trunks will suit it?