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Joined: Nov 2005
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Hi all, sorry if this topic has been done to death... I have 6 IP phones, 4 of which are offsite connected via VPN (between two different ISPs - Telus DSL at remote to Shaw cable at CTX). I can hear people who I'm talking to perfectly, however I come across fairly garbled to the people. Is this just because my voice packets have to travel about 1700 kilometers round trip because I'm using two different IPs? Or are there some settings I can change? 1700 kms seems like a long way to travel, when the CTX is only 5 kms away!!  Thanks in advance! Allan
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Joined: Sep 2005
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First thing you will need to find out is what compression rate your voice packets are leaving your local site .
Let It Be , I live in a Yellow Submarine . SCCE
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Many DSLs have a much higher download speed. I would guess that you may not have enough upload bandwitdh. See if you are using G.729A or G.711.
If it is set for G.711, you may have to change it to G.729.
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Joined: Nov 2005
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I have 95kb upload speed (260 down) - shouldn't that be enough? I tried switching from G.711 to G.729 - it didn't really make a lot of difference.
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Former Moderator-Toshiba, Request an Installer
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Is that a circuit you are sharing with Data? Remember each IP phone uses up to 110 kb of bandwidth while on a call.
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You don't have enough bandwidth for that many phones. I suggest minimum 128K, preferably 256K or more. Definitely go with G.729, make sure 802.11p is turned off, and set the jitter buffer length to about twice the highest recorded jitter in IPT QoS.
Joe
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No trees were harmed as a result of this posting; however, many electrons were severely inconvenienced.
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Joined: Jul 2005
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For clear voice quality BOTH ways, your upload and download speeds should be sufficient BOTH ways. 95K is too low, even for G.729a
Also don't forget to switch to Voice Packet Configuration = 2 when using G.729a
- alfee -
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Joined: Nov 2005
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Thanks for the suggestions! Just to clarify: I have one phone at my house (640kbps upload/ 2.5mbps down) three at another remote location (1.0 mbps upload, 4 down). Now that I think about it a bit more, I think the bottleneck is at the office where we only have about 2 mbps download, and 512 kbps upload. I did change my phone back to G.729 (packet table 2) and the quality is better now... guess I was just trying it on an exceptionally high traffic day. I'm hoping for fibre at the office location by fall...
Thanks everyone!
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