Our company (COMPANY A) recently merged with another company (COMPANY B). They had a 6 digit extension plan and we had 4. We've since converted our CUCM from 4 to 6 digit dialing. However, they still have their own cluster as we haven't merged the 2 CUCM's yet. The 2 clusters are connected via SIP trunk. We have one site in particular that when receiving calls from the other companies cluster the phone continuously rings even after they lift the handset or hit speaker.
The line settings look fine on these phones. The SIP trunk settings look ok, to my limited knowledge of SIP trunks. Route patterns are obviously correct since the call makes it to the destination. The calls work when the full number is dialed, just not the new 6 digit extension. Call going back the other direction work, so it's just calls originating from COMPANY B-->COMPANY-A\Site D @ 6 digit extension.
