My customer has a 10mpbs fiber connection to the Internet so we have always assumed that the connection is not really a problem. We will look into it. Thank you.
On Thu, 2008-07-10 at 17:49 -0500, John Faubion wrote: > > -----Original Message----- > > Subject: [asterisk-users] Diagnosing dropped calls... > > > > I have a system that is driving me nuts. My customer > > is running Asterisk 1.4.20.1 on a CentOS 5.2 server. It is a > > purely SIP and IAX2 service with no cards installed and it > > uses ztdummy from Zaptel 1.4.11. > > They use Teliax for calls to the USA and Protel for calls in Mexico. > > > > The problem is that users complain that their calls get dropped. > > Sometimes every few minutes and sometimes after a very long > > call over two hours so there is no clear pattern. There is a > > I just went through this same scenario. The customer originally using Teliax > over AT&T DSL. Incoming calls would sometimes have a delay of 1-2 seconds > before connecting and some would just drop at random intervals. We would > generally see in the logs that our connection to Teliax would often show > lagged or unresponsive around the time of the drops. Testing with AT&T > revealed that the customer was 18,034 feet from the CO so we decided to move > them to a cable modem from Charter. This was done as it was the only other > internet provider short of a dedicated T1. Things improved but did not > completely subside. The delay on answering was becoming the major complaint. > We decided to try a different provider so an account with Junction Networks > was added. This eliminated the delay immediately but did not eliminate the > dropped calls. One of the techs at Teliax told us that the delay was an > issue caused by Asterisk 1.4 trying to talk with Asterisk 1.4 server. We > tried their work around but it did not eliminate the delay issue though it > did reduce the issue. We also had Charter monitor the service for nearly two > weeks in which time they replaced the modem 4 times and claimed to have > repaired connectors, replaced repeater nodes and changed other connections > to no avail. The customer lives and dies by their telephone so we moved them > to Cbeyond SIP Connect. All of the issues are now gone. The is no delay, > they some times spend hours at a time on training calls with no issues. I > also did a bit of testing with the Junction Network account after moving to > Cbeyond. This was done since we still had money in the account anyway. Again > no more issues with dropped calls. The key is in an Internet connection that > is either very clean or supports QoS. The Cbeyond connection seems to have > both. Obviously we don't have QoS back to Junction but with the cleaner > connection it doesn't seem to matter. Also if you trying to use a cable > modem, make sure your using a business class service and not a residential > service. > > Also use mtr (mytraceroute) to look at the latency between your server and > the proxy. Under Charter and AT&T, both of which were business class > services, the mtr would sometimes show up to 20% packet loss at various > systems between us and the proxy. Also try different proxies. For us the > best one was typically either Atlanta or Denver. Keep in mind that I'm not > bashing Teliax or Junction. I use both Teliax at home and Junction in our > office, over a cable modem provided by Time Warner and the only issue I have > is the occasional delay on answer with Teliax. However that one is the home > line and the delay seems to work great for telemarketers. > > John > > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > AstriCon 2008 - September 22 - 25 Phoenix, Arizona > Register Now: http://www.astricon.net > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users -- Telecomunicaciones Abiertas de México S.A. de C.V. Carlos Chávez Prats Director de Tecnología +52-55-91169161 ext 2001
signature.asc
Description: This is a digitally signed message part
_______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users