Dears
Recently I encountered a problem in case of one way audio between two IP-Phones
In my case I installed cucm cluster(one Publisher and one Subscriber) ver 11.5.1
Our phones are 7841 with firmware ver 11.5 , all of switches are cisco 2960-X series with 1G ports and i create some data vlan for pc and some voice vlan for ip-phones and simply one Cisco 3850 switches do inter vlan routing between vlans
Routing is completely fine because computers and ip-phones in different vlans connect to each others without problem .
Sometimes and fully randomly users report that when dial other ip-phone(one ip-phone call ather ip-phone) they can't hear other side and in sometimes both of sides can't hear each others but when disconnect and dial again everything is ok , some days it happens more but some days never happens
I had this problem in other project with 3905 phones but that problem was solved by enabling MTP in each phone and configuring media resource group list in CUCM (Software MTP) but in this case it didn't work
Please let me know how can solve the problem???
Thanks
