asterisk users - Dec 2005 - Meetme and Sipura SPA-941 - bad jitter/distortion

I have a new * 1.2 server running on a dual-processor machine, 1GB of RAM,
Gentoo with Linux 2.6 and a Digium TDM400 (four fxo boards) installed.
Everything has been working great until we tried our first Meetme conference
call yesterday.

 

I have a total of 12 extensions.  9 of them are in the office with a direct
connection to the server, all of the phones are Polycom 501s.  The three
remote users have the new Sipura SPA-941.  I decided on this phone because
of the features and it was easy to setup behind NAT (which all of these
users have).  Regular calls to these users work great with no issues at all.
It's been wonderful.

 

However, we had our first company conference via Meetme yesterday, and the
SPA-941s sounded horrible in the conference.  Very distorted, jittery sound.
It was surprising and we ended up having them call in on the POTS line and
come in that way - and it sounded fine.  So, I thought maybe it was a
connection issue, but tested with one of our remote uses and have narrowed
it down to the phone.  If the user connects with X-lite to the conference
room the sounds is great.  If he then calls back with the SPA-941, the sound
is horrible.  Hanging up and dialing the extension directly to the SPA-941
sounds good as well.

 

Any ideas what could be going on and how to fix it.  I thought it could be a
timing thing.  The documentation on the Sipura phones is non-existent at the
moment, so I have no idea what might be able to be changed.

 

I'd greatly appreciate any help or thoughts!

 

Ryan Booz

Director of IT

Good Steward Software, LLC

111 Sowers Street, Suite 400

State College, PA 16801

Phone: 877-327-3702 x.26 (814-237-3744 x.26)

Fax: 719-623-0577

Visit us at www.energycap.com

 

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> 
> I'd greatly appreciate any help or thoughts!
try: RTP Packet size on "SIP" tab

> Any ideas what could be going on and how to fix it. I thought it could 
> be a timing thing. The documentation on the Sipura phones is 
> non-existent at the moment, so I have no idea what might be able to be 
> changed.
>
> I?d greatly appreciate any help or thoughts!
>
How about disabling silence suppression on the phones. Give it a try and 
see.
>  
>

-- 
Andres
Technical Support
http://www.telesip.net

Are any of the phones setup to use a codec payload of more than 20ms?
Bugid 5697 on the
bug tracker has a patch to deal with very poor MeetMe performance when
any of the participants
are using audio packetization greater than 20ms.
 
Beta1 and beta2 did not have this problem, and I am not sure about the
RC versions.  Which
codec is the 941 using?
 
Dan


________________________________

	From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Ryan Booz
	Sent: Thursday, December 08, 2005 8:27 AM
	To: asterisk-users@lists.digium.com
	Subject: [Asterisk-Users] Meetme and Sipura SPA-941 - bad
jitter/distortion
	
	

	I have a new * 1.2 server running on a dual-processor machine,
1GB of RAM, Gentoo with Linux 2.6 and a Digium TDM400 (four fxo boards)
installed.  Everything has been working great until we tried our first
Meetme conference call yesterday.

	 

	I have a total of 12 extensions.  9 of them are in the office
with a direct connection to the server, all of the phones are Polycom
501s.  The three remote users have the new Sipura SPA-941.  I decided on
this phone because of the features and it was easy to setup behind NAT
(which all of these users have).  Regular calls to these users work
great with no issues at all.  It's been wonderful.

	 

	However, we had our first company conference via Meetme
yesterday, and the SPA-941s sounded horrible in the conference.  Very
distorted, jittery sound.  It was surprising and we ended up having them
call in on the POTS line and come in that way - and it sounded fine.
So, I thought maybe it was a connection issue, but tested with one of
our remote uses and have narrowed it down to the phone.  If the user
connects with X-lite to the conference room the sounds is great.  If he
then calls back with the SPA-941, the sound is horrible.  Hanging up and
dialing the extension directly to the SPA-941 sounds good as well.

	 

	Any ideas what could be going on and how to fix it.  I thought
it could be a timing thing.  The documentation on the Sipura phones is
non-existent at the moment, so I have no idea what might be able to be
changed.

	 

	I'd greatly appreciate any help or thoughts!

	 

	Ryan Booz

	Director of IT

	Good Steward Software, LLC

	111 Sowers Street, Suite 400

	State College, PA 16801

	Phone: 877-327-3702 x.26 (814-237-3744 x.26)

	Fax: 719-623-0577

	Visit us at www.energycap.com

	 

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