[Asterisk-Users] IVR Menu and VoiceMail quality

[Jay Milk]

Do you have ztdummy loaded?

> -----Original Message-----
> From: Chris Shaw [mailto:chriss at watertech.com] 
> Sent: Friday, July 09, 2004 1:14 PM
> To: asterisk-users at lists.digium.com
> Subject: [Asterisk-Users] IVR Menu and VoiceMail quality
> 
> 
> I have really tried to do my best googling and wiki-reading 
> before asking this question. I couldn't find the answers 
> there so I throw myself at the mercy of the list...
> 
> I get excellent quality for SIP -> PSTN and PSTN -> SIP 
> calls, however when I or anyone else calls from PSTN -> * the 
> voice menus are oftentimes very choppy. Sometimes they are 
> absolutely perfect and I cannot tell that it's actually VoIP. 
> Sometimes it's so bad that I can't understand what Allison's 
> saying at all... Calls on the same network sound just fine... 
> I know what you're thinking, it's a congested link, and that 
> may be but I've noticed that if I play with the nice value of 
> asterisk, it seems to help. Setting nice to 0 seems to work 
> the best, I tried -20 and it was the worst...
> 
> I have implemented QoS on my network and have given any and 
> all asterisk packets priority. As I said actual calls are 
> crystal clear so I believe it to be a problem with Asterisk 
> itself or the machine it's running on. Possibly some 
> bottleneck somewhere. I realize that since it's going over 
> the public internet, the occasional dropped packet is to be 
> expected, but what's frusterating is that I can get crystal 
> clear menus sometimes even when my network is fully loaded 
> and other times when it's perfectly quiet it sounds 
> absolutely horrible...
> 
> Here are the machine's specs if that helps:
> 
> AMD Athlon 1Ghz (Old Thunderbird core)
> Asus A7V600
> 128MB DDR-266 RAM
> 450GB storage (4 IDE drives in an LVM array) *grin*
> Pure VoIP, no digium hardware
> 
> Internet connection is cable with 3Mbit downlink and 256Kbit uplink...
> 
> As I said earlier I wouldn't have even asked, but it dosen't 
> seem to be totally bandwidth related so I'm wondering if 
> anyone has any ideas...
> 
> Chris Shaw
> IS Manager
> Water Tech Industries
> Phone: (888)-254-8412
> Fax: (503)-261-9118
> E-Mail: chriss at watertech.com
> 
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