1: If sender doesn't have route to 10.10.30.0/24 subnet then nothing much that you can do. Probably, you can check you debug filters" get ff" to make sure your filters are correct.
2: You can do the testing other way, initiate the traffic from your VoIP interface to the new branch IPs and capture the debug flow basic. If you see packets going out and no response then check wirth other device, whether they are seeing the packets or not.
Thanks,
Vikas