[asterisk-users] Rusting Snoms?

[Christian Stredicke]

It could be that the PCAP resolution is 10 ms. The phones don't have a real-time clock... But 50 ms is definitively not okay.

CS

-----Ursprüngliche Nachricht-----
Von: Tim Panton [mailto:thp at westhawk.co.uk] 
Gesendet: Dienstag, 19. Mai 2009 13:46
An: Asterisk Users Mailing List - Non-Commercial Discussion; Christian Stredicke
Betreff: Re: [asterisk-users] Rusting Snoms?

Christian, thanks, I'd never run pcap in a phone before - cool.

The trace shows jitter - but in a weird way. some of the packets have  
delta's of
 > 20 ms but always a multiple of 10 so 50 and 30 occur, as do 10 and 0.

Is that normal ?

Tim.


On 9 May 2009, at 11:04, Christian Stredicke wrote:

> Because the phone is a digital system, I would suspect that it is a  
> problem with the switch. Run a quick PCAP trace to see where the  
> jitter comes from. Depending on the firmware version, you can do  
> that from the web interface.
>
> CS
>
> -----Ursprüngliche Nachricht-----
> Von: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com 
> ] Im Auftrag von Tim Panton
> Gesendet: Samstag, 9. Mai 2009 11:46
> An: Asterisk Users Mailing List - Non-Commercial Discussion
> Betreff: [asterisk-users] Rusting Snoms?
>
> This is a bit off topic, because I 'think' it isn't an Asterisk  
> problem.
> However I'm not sure and anyhow I'm hoping someone may recognize the  
> symptom.
>
> We moved offices a month ago. Our trusty SNOM190s (all between 3 and  
> 5 years old) were packed up for the move, then unpacked a couple of  
> weeks later.
>
> On unpacking them and connecting them to the new network, several of  
> them didn't work well. The symptom is that outgoing RTP audio is  
> garbled - like the packets are pulsed. Inbound is fine. This isn't  
> true for all of the phones, just some of them. (The all run the same  
> SNOM firmware)
>
> To be fair, they are on a new network, so it could be the cables or  
> new 1Gb switches, except that the problem moves with the phone if  
> you relocate it from one desk to another.
>
> I've tried a fresh asterisk install, but that didn't help either.
>
> So I am forced to conclude that something went 'bad' in those
> (old) phones while they were switched off. Has anyone got any clues  
> for me?
>
> Thanks!
>
> Tim.
>
> Tim Panton - Web/VoIP consultant and implementor www.westhawk.co.uk
>
>
>
>
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Tim Panton - Web/VoIP consultant and implementor
www.westhawk.co.uk