-----Original Message----- From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Ishfaq Malik Sent: 27 May, 2011 10:54 To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] Audio dropping
On Fri, 2011-05-27 at 10:31 +0200, Mark Scholten wrote: > Hello, > > We see some strange behavior with phone calls, we use Asterisk 1.8.3.3. > > SIP clients (all behind NAT at different locations, so not a single > NAT solution is used): > - x-lite > - linksys pap2t > - polycom kirk (multiple type numbers) > - polycom (multiple type numbers, hardware phones) > > Our Asterisk servers stays in between (some calls are recorded). > Asterisk is running on a physical server (no virtual server software) with "old" > hardware (Xeon 3.2 GHz with hypertrading and 4GB RAM, mainly used for > buffers). We use a MySQL backend (CDR records are stored in it and SIP > users are stored in a MySQL database). > > We use a SIP provider with a trunk for outgoing and incoming calls, > this is also an Asterisk server if I'm correct. We currently do around > 1000 calls a week and max. do 10 calls at the same time. The Asterisk > server is not behind a NAT. > > What could the reason be audio in 1 direction is dropping? (Normally > from the Asterisk server to the mentioned SIP clients.) No clear > information is in the logs (it is like the call ended normally) and > not all calls are having problem (most not, but it happens to often > for us to start using VoIP more at the moment). > > To test if it was the firewall we disabled the firewall on the > Asterisk server and moved the Asterisk server before the other firewalls we have. > > What could the problem be? And even more important what could solve it > (and/or explain it)? > > Kind regards, > > Mark Scholten > Hi Are the broadband connections to the target SIP extensions dedicated for VoIP or does any other traffic run over them? We tend to find that 80% of call quality issues are caused by the broadband connection. A good diagnostic tool to keep an eye on the broadband connections involved is smokeping http://oss.oetiker.ch/smokeping/ We find it an absolute godsend. =============== Hello, Ping is disabled on the location with most call problems (filtered). A few clients with dedicated audio broadband connections have the same problem compared to "shared" broadband connections. This makes it very difficult to find the problem. A supplier we use offered to test it with a server from them, if that solves it it was probably a network issue. Regards, Mark -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users