[asterisk-users] Call audio leaking between calls

[Ishfaq Malik]

Hi All, getting somewhere with this and thought I'd share it in case 
anyone else has the same problem.

First of all, thanks to Doug who told me it's called cross talk and thus 
helped me find solutions.

This makes interesting reading about the topic

http://forums.digium.com/viewtopic.php?t=4048&highlight=&sid=b0524e2ff689fe6ae3387a5ee6d7d92c

Now there is an issue that the SIP device should reject any packets not 
specifically destined for it but that's a separate issue.

Our customer has a switch but a non configurable one which sounds no 
better than a hub to me, I think I'm going to have to get him to invest 
in some better hardware.

Ish

Ryan M. Colbert wrote:
> I agree with the cross talk analysis. My suggestion would be to focus your efforts on the analog trunks/stations, not SIP. Are you using twisted pair or shielded cables for your analog runs?  If not, you might consider changing the cables or at least increasing the physical distance between them - in my experience this is the most common cause for cross talk.
>
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Ishfaq Malik
> Sent: Tuesday, November 10, 2009 7:47 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Call audio leaking between calls
>
>
> Doug Lytle wrote:
>   
>> Ishfaq Malik wrote:
>>
>>     
>>>>      Has anyone ever had experience of phones on the same office network
>>>>      being able to hear other concurrent call's audio whilst on calls of
>>>>
>>>>
>>>>         
>> It's called cross talk and yes, we've experienced it.
>>
>> But, it will only happen on an analog network (PSTN).  At that point,
>> the provider had to check the analog lines.  It eventually was fixed.
>>
>> In a purely SIP environment, you shouldn't see this.
>>
>> Doug
>>
>>
>>     
> This is what I'm thinking too and it's a weird one to try to pin down,
> especially as I've currently got very little information. I think I'm
> going to use Monitor on all their calls and see if the recordings show
> any signs of this cross talk but even if they do it still doesn't help
> to resolve the issue.
>
> You'd think it would be an impossibility due to the nature of IP traffic.
>
> Ish
>
> --
>
> Ishfaq Malik
> Software Developer
> PackNet Ltd
>
> Office:   0161 660 3062
>
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-- 
Ishfaq Malik
Software Developer
PackNet Ltd

Office:   0161 660 3062