We have 3 different office locations and an extension 5678 which exists locally at each location. -5678 in HQ_Partition -5678 in BR1_Partition -5678 in BR2_Partition
CSS are defined for each site to direct the calls and is working perfectly fine. When someone at BR1 dial 5678, call routes to the phone at BR1.
Recently got a DID line xxxx 5678 from our TSP, because we wanted this number to be reachable for external callers. Now, we would like to point that DID to HQ_Partition only, meaning someone externally dials XXXX 5678 , the call gets routed to phone at HQ.
If I understood it correctly, all internal location partitions might be a member of the existing SIP trunk/GW inbound CSS to allow the incoming DDI calls. (Assuming centralised PSTN/SIP connection).
I will try the following way,
Create a partition 5678_HQ_Partition and assigned it to DN or TP depending on the dial plan
Assign the 5678_HQ_Partition to all HQ CSS's [if step 1 is DN]and the Inbound CSS of the Trunk/GW.
Assuming, you are only sending the last 4 digits from the GW to the call manager. you should get an idea now by reading @b.winter and this post. IF you are still not clear, kindly share the following details.
Significant Digits from Call Routing Information - Inbound Calls (Gateway / Trunk configuration
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