I am having an issue with one-way audio from our remote office Phone to our HQ, so the problem is that on calls (inbound, outbound) we get no audio from the Phone that resides on one of our remote offices (meanwhile other offices work just fine with the same setup).
We have the CUCM v11.0 (Publisher & Subscriber) which is reached by phones through DMVPNs configured on Cisco ISR4331 (CUBE), the phone that I am testing on that remote office is a 7811.
I tried gathering logs from calls and I can see no issue from what I could read and understand, also tested routing from HQ to that office and vice versa and everything seemed just fine.
Could you please give me any hint, tips or any ideas how to troubleshoot and maybe solve this issue that I'm facing?
As others have said, it can typically be a routing issue, but it can also be NAT or Firewall rule related too, specifically if any Firewalls in the path are not allowing the RTP port range required. Best to check on that too.
While troubleshooting the issue, you can make a live call and if the phone has web access enabled, click on the IP address of the registered IP phone in CUCM and check the streaming statistics or if the phone is local double tap the "?" key and that will tell you which IPs are being used to send and receive RTP and check on the counters for packets sent and received.
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