Let me first start with the fact I am a complete noob when it comes to these systems and I am only just starting to feel my way around.
Ok so I have a IPECS UCP100 ISDN soon to be Sip
We are currently joining all our external sites to the same system across a Sophos Red 15 and UTM setup
I have 41XX extensions at head office and 31XX at one remote site
How do I add further ones for the other sites? say 51XX and 61XX
appreciate any help you can provide