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104 posts

Master Geek


Topic # 26887 6-Oct-2008 18:49 Send private message

Hi everyone,

I have installed some SPA-942 phones running on a wireless broadband connection here in Hamilton.

Unfortunately I am having a lot of trouble with the voice dropping in and out (this is what people calling us tell us, and what I have experienced when I have been called from the VoIP system to my mobile).

I have fiddled with using different codecs and RTP packet size in the SPA config, but nothing seems to make a real difference.

The bandwidth is great - when I run a bandwidth test we get at least 2mbps each way.

Has anyone had any experience setting up VoIP phones over a wireless broadband, and got any ideas on what I can try to improve the calls?

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  Reply # 169375 6-Oct-2008 19:01 Send private message

Sounds your connection has a lot of latency on it (which is common with wireless) - who are you using as your SIP provider?




307 posts

Ultimate Geek


  Reply # 169392 6-Oct-2008 19:51 Send private message

I have WIC wireless here in Dunedin..
Connection is 2mb Down - 512kb up
Our VOIP provider is Xnet with VFX - on a Linksys PAP2T

What i have found is...

If the wireless network is busy-- from a ISP point of view or localy in our flat, we will get alot of dropped packets and latency.
This makes call quality very bad and sometimes even drops calls..

I think this is mostly because of QOS..
Because our Wireless provider does not prioritize the VFX traffice..

I am thinking about switching backto DSL next year.. hope that fixes it..

But all in all.. the VFX quality is very most the time.. its only 20% of the time its really bad..
But its not Xnet fault..



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Master Geek


  Reply # 169403 6-Oct-2008 20:36 Send private message

Hi Thanks for the replies.

The SIP provider is 2talk

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  Reply # 169415 6-Oct-2008 21:07 Send private message

What kind of router do you have hooked into your wireless connection? What voice codec is default on the SPA's?
- having a router that will do QoS at your end will help
- using G729 voice codec is also better for a variable connection (and as these are IP phones voice quality will still be very good).

You are ultimately at the mercy of your wireless provider though. Perhaps enquire if they have and QoS features they can apply between you and 2talk.




Chorus has spent $1.4 billion on making their ADSL broadband network faster. Why not spend a couple of hundred to make sure you are getting the most out of your connection?
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  Reply # 174082 28-Oct-2008 14:36 Send private message

We run Araneo wireless over ICONZ in Auckland 2mbps up/down guaranteed but usually around 10mbps. We have a trixbox and pfsense router and can have 4 concurrent calls over vfx while saturating our internet with data transfers no issues in quality at all. We usually get a latency of around 10ms to ICONZ core. Sounds like a QOS issue for you?





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  Reply # 174577 30-Oct-2008 10:03 Send private message

Comes down to the quality of the wireless provider. For comparsion, I have tried VFX over a community based wireless network. This suffers alot of variation, thus call quality can be a problem. Same can of course be said for DSL, so you just need to give it ago an see.




Chorus has spent $1.4 billion on making their ADSL broadband network faster. Why not spend a couple of hundred to make sure you are getting the most out of your connection?
Geekzone special price: $150* for master splitter install, normally $200+ through your ISP. Auckland and Waikato areas.
*Travel charges may apply. Additional costs may apply for complex installs.
I install - Naked DSL, DSL Master Splitters, VoIP, RBI Rural Broadband. Also a dealer for WorldxChange.
Need help in Auckland or Waikato? Click my email button, or email me direct: [my user name] at geekzonemail dot com



104 posts

Master Geek


  Reply # 174676 30-Oct-2008 17:13 Send private message

Hi Thanks for your replies.

I have recently installed a Trixbox for them, and connect to the VoIP provider via the IAX2 protocol.

They are pretty sure they have noticed an improvement, but are giving it another week or so before having a definite conclusion.

Will let you know

Cheers

364 posts

Ultimate Geek


  Reply # 177233 10-Nov-2008 22:43 Send private message

Latency will be the killer.

G729 would def help as well as QoS

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