I have Gateway MGCP (IOS) with CallManager 4.0 (2a), the Num Plan based on 5 digits for Phones.
When I receive an incoming call bound for a Phone I see that the operator presents only the last 4 digits to me. That it work if my number ( DN ) called is single. But here is in our internal num plan we use DN with 4 digits (RoutePoint, DN RightFax, and other). What occurs sometimes it is that if external call is received bound for a phone and that the last 4 digits correspond to another number (DN) the CallManager will take the most precise DN and the call will not go to the phone.
Iphone DN : 11000
Route Point DN : 1000
External Call to ipphone 11000 -- (incoming Call ) Gateway MGCP ( Digits pr?sent?s : 1000 ) ? Routing call by the CallManager to the RoutePoint DN:1000 (( not to the Iphone DN 11000 ).
It?s possible to use the ?Prefix DN? option on the Gw MGCP configuration of CallManager to add a ? Prefix DN 1xxxx ?
So, is the telco only sending you 4 digits? You could use 1 for the Prefix DN field which would add 1 to ALL incoming calls. If you receive incoming calls for your route points, etc. on this gateway, this could cause a problem as 1000 would become 11000.
You would just configure Prefix DN as 1. I think a cleaner, more scalable solution would be to have the telco send you 5 digits or all digits. In the future, you may need to allow numbers in the range 2xxxx. Then, your Prefix DN of 1 would not work. Just something to think about.
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