Some background first.
We have 11x CISCO7970 SIP handsets running SIP70.8-4-1S, App Load ID 8-4-0-79
Asterisk (Ver. 22.214.171.124)
I have tried several different software variants for the CISCO7970G and NO change to the problem…
There are 11 phones on the network and we all can make calls, answer calls etc but everyone has problems retrieving call after they are put on hold or completing an internal transfer.
When calls are placed on hold, they are still seen by the handset however pressing the hold button to retrieve the call does not work, nor the transfer. Any ideas to solve this issue?
As weird as this may sound, sometimes we can hear them but they can not hear us when they are on hold and we are trying to retrieve them…