Trixbox Remote
Submitted by Ricky Smith on Thu, 05/08/2008 - 2:37pm.
So I'm wondering what the quality will be like if most of the phones are in remote locations, and what would be the best way to go about it. I'm going to have a TrixBox server with 1 phone internally and the rest of the extensions will be remote using Cisco IP Phones. What should I expect for quality assuming that the internet connections are decent?
Quality Varies Widely...
Thu, 05/08/2008 - 6:29pm
There's not enough information in your post to really determine how good the quality is going to be. TB is easy enough to set up... it's not a huge time or resource investment to actually seeing for yourself how it will work.
Are you running over the Internet or are you on a private network? Does your carrier have any sort of an end to end QOS guarantee? If you're going over the Internet on some sort of an asymmetric connection - you probably don't have any service guarantees or respecting of priority tagging.
That said, it can work just fine in many cases. You might have better luck licensing G.729 and running it on smaller links.
If you have persistent congestion or latency issues, your voice quality will be bad. Period.
Hope that helps,
Josh
It will be running over the
Thu, 05/08/2008 - 7:06pm
It will be running over the internet, it's not some high call volume system so we're not expecting to have like 20 calls going on and many phones. It's going to be a Trixbox Server running on one end with 1 internal phone (being mine) connected to a cable modem connection now it will have QoS internally on the network so it gets priority to the outside world but from there on its fair game. Also on the phone end in the remote location it will also have QoS so the question is assuming there's decent internet connection. What would one be to expect?
Your success in this relates
Fri, 05/09/2008 - 3:32am
Your success in this relates in part to bandwidth of the internet connections available at every point where there is a phone, and partly on what your ISP's are doing the the traffic.
Have a look here to work out what codecs will work for the bandwidth you have:
http://www.voip-info.org/wiki-Asterisk+bandwidth+iax2
If you have the option of VPN-ing remote sites together and running the VOIP traffic down the VPN, you will save yourself some firewall and NAT hassles. Also, if your telco is also your ISP, they may implement some management features designed to introduce jitter to the voip calls to protect their existing phone business. Telecom NZ did it. They may have stopped doing it now.
Now I thought I read this
Fri, 05/09/2008 - 10:45am
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2007-06-05