[Asterisk-Users] Snom high SIP ping time

[Christian Stredicke]

If you ping on the SIP port the message has to go through the
application layer - which takes some time considering it is an embedded
system with a small CPU. That part should be ok.
 
It the phone becomes choppy, that problem is probably related to the RTP
side. Maybe you have different packet sizes for incoming and outgoing
traffic. You can get an Ethereal trace from the web interface of the
phone which should show you the RTP jitter (PCAP trace). Or use a hub if
you don't trust that trace. 6.1 is the latest version if you want to try
the latest image (http://www.snom.com/wiki/index.php/Beta_Firmware). 
 
Hope that helps, CS


________________________________

	From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Mike
Hammett
	Sent: Monday, June 12, 2006 3:01 PM
	To: asterisk-users at lists.digium.com
	Subject: [Asterisk-Users] Snom high SIP ping time
	
	
	I don't know everything that's going on as someone else has been
working on the project, but it hasn't really been going anywhere, so I
had some questions.
	 
	We've got some Snom 320s with Asterisk 1.2.9.1 (I believe).  All
was well (with a previous release), but the phones started to get real
choppy.  We are also running a softphone at this location and it was
fine.  The SIP qualify was returning ping times anywhere from 20 to 70
ms over a sparsely used LAN.  Command prompt (ICMP) pings were under 1
ms.  No amount of different Asterisk versions or phone firmware
revisions seems to solve this.  All was well, then (as far as we know)
without changes, it crapped out.
	 
	Any ideas?
	 
	 
	----
	Mike Hammett
	Intelligent Computing Solutions
	http://www.ics-il.com
	 
	 

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