My UC System include 2 CUCM 6.1 , 1 Unity Connection 2.0, 1 Voice Gateway 3825 with 12 FXO, 1 Operator with IP Phone 7962 ( 2 Expansion Module 7914). We can do outbound call very well. Unfortunately, when customer from PSTN do inbound call to my Operator, they sometimes get one way audio call that means customer can hear operator 's voice but Operator can not hear customer voice. This call is happen very intermittent about 10 inbound call success i get 1 one way audio inbound call. I try to do many ways to solve as below but it is still happen:
- Check IP Routing, i can ping everything.
- Add command : h323-gateway voip interface h323-gateway voip bind srcaddr
voice rtp send-recv
- Set CUCM 's eth0 to auto, auto (1000Mbps)
- All IP Phone, VoiceGateway register on primary CUCM
My boss is not happy about that. Please give me your recommends to solve it quickly.
Thanks and best regards,
P/s: i send to you my Voice Gateway 's configuration
I am sorry for late information to you coz i went to holiday with my family.
Let me make sure I understand.
You have 12 FXO ports on one ISR Router, H323 to your Call Manager cluster.... there is a DID or mulit-DID's pointing at the 12 FXO's from the PSTN. Users calling in, 10% are one way audio....??
Yes they are, but the customer call from PSTN will forward to Auto-attendant of Cisco Unity Connection. Then customer dial 0 to reach Operator. When they connected to Operator one way audio happen but very randomly.
Ok -- so one way what way? The PSTN caller can hear you but you (IP Phone) can't hear the caller or the other way?
Is it always the same phone that gets the one-way audio?
Yes it is, correct
Can you duplicate it by calling your inbound number 10 times from your cell phone, do you get one-way?
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