User Complains of a speed dial sound then garbled incoming voice, Trixbox CE, Aastra

User A: Employee (with desk phone - Aastra 9133i)
User B: Mobile Phone User, Same person each time (national carrier GSM Network)

User A sitting at their desk answers incoming phone call from User B.  At a random time 3-10 min User A hears a fast dialing string followed by garbled speech from User B.   Although User B on mobile phone has no quality issues, nor hears fast dial string.  

No other users have had any complaints that even are slightly similar to what this user is having problems with.  This issue does not occur if User A initiates the call to User B.


Corrective Steps I have tried:
- Removed small switch between walljack and users desktop computer.
- Checked all configuration for Extension in Trixbox CE, compaired to other extensions.
- Tested all wiring.
- Changed switchports on switch (Dell PowerConnect)
- Swapped phone out with different Aastra 9133i
- Firmware is concurrent with all other phones on network.

Trixbox Features:
- Running Sangoma A200 (4-port FXO card, with echo cancel option)
- Trixbox CE 2.6.2, YUM'ed up-to-date
- 25 users connected to the Trixbox system.
LVL 2
heim0698Asked:
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heim0698Connect With a Mentor Author Commented:
Yes, I have had the verbose logging enabled with SSH up and running in the background of my computer trying to keep an eye on it.  Hard thing is, never knowing when it is going to happen.  My thoughts were the same as your with the system possibly picking up another FXO analog trunk and dialing out a currently connected trunk, but no users complain of calls not going through.  I'll keep an eye on it.

The problem while on the phone is:  Caller on VoIP phone hears quick speed dial, then speech from the other caller sounds like a robot.  It is clear, but the voice has just changed to robo-speak.  Any last thoughts?
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grbladesConnect With a Mentor Commented:
I would connect to trixbox using 'asterisk -r -vvv' and leave it showing the log. Then when the problem occurs you can see if trixbox is trying to dial out the same line.
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heim0698Author Commented:
Finally I could take a look now that the problem happened again.  It occured when one user was on phone and other users started to join a specific conference bridge.  It only happens when they join a specific conference bridge.  I will test and recreate the conference number for web-meetme and see how it goes.
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