maybe not related to your problem, but I had a similar effect after "upgrading" my 1.6 to 11. not on phones (pbx was used as ivr only), but voicefile were played in a robo style unconditionally.
this effect could only be gotten rid of by rebooting the server.
i had to completely clean the installation and rebuild 11 from scratch... i think some mp3 classes have caused the effect... (although no mp3 files were used..) when the effect occurred, there was nothing that hinted to any problem... cpu usage, network etc. everything was fine, but even only restarting asterisk did not help... i think some libs got messed up during update.

so i´d recommend to rebuild the server complete from scratch... if the problem still exists after new build... it would be interesting to know, if you just took the same config-files
from your previous version which would maybe cause problems...

if all fails, i would then go deeper into network analysis and trace the traffic.

meanwhile i administer around 10 asterisk boxes and i always use ubuntu 12.04 lts and latest asterisk 11 on dell r3/4/6xx servers... up to now everything runs fine..

regards,
yves


Am 14.02.2013 07:20, schrieb Julian Lyndon-Smith:
very polite *bump*

this is a real issue for us - anyone got _any_ clues or ideas ?

Thanks ;)


On 12 February 2013 14:29, Julian Lyndon-Smith <aster...@dotr.com <mailto:aster...@dotr.com>> wrote:

    Ever since we upgraded to asterisk 11 we have had audio problems with
    our cisco 7940 phones.

    The problems manifest themselves by the conversation turning "robotic"
    or into silence (to the extent our agents are saying "hello? hello?"
    and the customer is saying "I hear you just fine"

    We had to change pedantic=no in sip.conf to allow the phones to
    register

    We are assuming that it is the phone<=>asterisk combination because

    a) the call recordings of the conversation are perfect (no noise on
    the line, conversation is clear) but it is apparent that the agent
    cannot hear the customer sometimes (Hello?)

    b) we have replaced the cables and switches between the phones and
    the pbx

    c) we don't have the same problem with Aastra 9133i or Polycom 331
    phones

    Are there any settings in sip.conf that may help this , or a
    particular firmware ? Are there any known audio problems with cisco
    7940 and asterisk 11 ?

    Many thanks

    Julian

    --
    Julian Lyndon-Smith
    IT Director, Dot R Limited

    "I don't care if it works on your machine!  We are not shipping
    your machine!"

    The kangaroo dances: http://www.youtube.com/watch?v=MAWl5iYOaUg




--
Julian Lyndon-Smith
IT Director, Dot R Limited

"I don't care if it works on your machine! We are not shipping your machine!"

The kangaroo dances: http://www.youtube.com/watch?v=MAWl5iYOaUg


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