[Asterisk-Users] Intermittent Silence

[Matt Hess]

Almost sounds like you and I have the same problem.. please check out my 
message (I just sent to the list) and see if it rings any bells would you?


Stuart Lester wrote:

>I am currently experiencing intermittent silences with my asterisk system.  
>The symptoms are as follows:
>	* Both for incoming and outgoing calls, I (and other users) 
>occasionally experience a brief period of silence.
>	* The silence lasts anywhere from 3 to 10 seconds.
>	* It is not due to silence suppression, because the silences 
>generally occur in the middle of sentences.
>	* Silences occur at various times of the day, for calls of various 
>lengths, and at different times during calls.
>	* Sliences have occured for incoming and outgoing calls, and 
>have affected both people on the VoIP side and the PSTN side.
>	* Silences have occured for devices from multiple manufacturers 
>(Currently we are using Polycom IP 300, IP 500, and Grandstream 101).
>	* Affected users are connecting to our asterisk system from 
>multiple geographic areas, using multiple ISPs, and all seem to have  
>reliable and acceptable network connections.
>	* All users are connecting to the asterisk system via SIP.
>	* Multiple "carriers" have been used, and the issue seems to not 
>be related to any particular carrier.
>	* Call load doesn't appear to be an issue, as the silences have 
>occured when the call in question was the only one on the system.
>
>The current asterisk system configuration is as follows:
>	* 1.2 GHz Pentium Celeron 512 GB RAM, Linux 2.4.21
>	* 10 SIP devices connected
>	* Connected to Carriers via IAX
>	* Using uLaw codec
>	* Using asterisk HEAD, built on June 28th
>	* Running ztdummy
>	* Server is not firewalled.
>
>I have tried, to no avail, to find a solution for this issue, and I am 
>having no luck.  The issue is perplexing, and quite bothersome to our 
>users.  Could anyone suggest any solutions, tests or anything?  At this 
>point, I'm getting frantic, and any help would be appreciated.
>
>Stuart
>
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>
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