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IP Phone 7910 and PBX U1910 call fault

Publication Date:  2015-08-03 Views:  411 Downloads:  0

Issue Description

Scenario: Calling from IP-PHONE to external number

Phenomenon: Sometimes, the call will be canceled after 15s.

Handling Process

  1. Call from extension 3202 to external number 21855057 two times, one time is successful and the other time is failed
  2. Save the log as LogAnalyer2. Lia(successful) and LogAnalyer3.lia(failed) as below.
  3. l   Analysis the two logs.

    n   As below picture, the left purple one is the successful, and the right one is the failed one.

    n   The Left (successful)number 3 we can see that after eSpace U1910 send a I8 CLD message to Operator-Carrier, Operator-Carrier feedback a A1 REQ message within 1 second(Number 2, 16:14:41).

    n   But in the right(failed) number 3 after eSpace U1910 send a I8 CLD message to Operator-Carrier , Operator carrier doesn’t feedback any message from 16:12:18 to 16:12:33. Around 15 s.


Root Cause

  1. the real site, it work normal most time, only in some time it will happen as the right picture above. So the eSpace U1910 work normal, and operator should check why do not feedback I8 message.
  2. Operator- carrier did a test in their side and check all the connection were ok and sometimes the return delay more than 15 from operator carrier.

Conclusion: Operator carrier feedback message to U1910, but it delays more than 15 s and U1910 could not receive because the interval time out is configured to 15 seconds, after this time U1910 drop the call



Increase the timeout interval in the PBX U1910 for 30 sec, using the command: config modify timerinterval pid r2 timergroup 1 timerindex 1 interval X (X means the time to increase)

After we change this time the calls could be completed normally.