7950 sometimes cannot hear ring back tone when make a call
7950 sometimes cannot hear ring back tone when make a call
Created: Mar 30, 2016 20:39:09Latest reply: Mar 31, 2016 08:07:59
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Issue Description
One oversea
customer reported when some users make internal calls, they cannot hear ring
back tone, the call could established after the second or the third
trying.
Alarm Information
Handling Process
1. Analyze the caller IP phone logs, in the failed calls , the caller side sent out the invite message to U1980, after 11 seconds didn’t receive 180 message, then the caller side sent a Cancel message to release the call.
2. Analysis U1980 logs, U1980 have received the Invite message from Caller side and sent the invite message to called side, but without any response, then U1980 keep sending invite message to called user.
3. Analysis called side IP phone logs, the called user didn't receive U1980 invite message, confirm there is a network issue between U1980 and called side. 4. After customer fixed the network, the no ring back issue didn’t occur again.
Root Cause
The network
between 1980 and called side is not stable cause the called side didn’t receive
invite messages.
Solution
After
customer check and fix the network between 1980 and called side, the issue
didn't occur again.
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Comment
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