Core Issue
Calls are failing to complete with a disconnect cause code of 2F - resources unavailable. Channels are available for use.
The user has configured max-conn parameter in the incoming VoIP dial peer that is being matched for the call. For example:
dial-peer voice 111 voip
max-conn 5
incoming called-number .
destination-pattern 111....
session target ipv4:10.1.1.1
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
no vad
Resolution
Remove or increase the max-conn value.