asterisk users - Feb 2006 - Opinions needed on call quality vs network latency

Hi,

I am checking out the quality at a few vendors, and althought I know it
doesn`t totally reflect call quality I am using ping as a cheap subsitute to
having a real VoIP testing system

The question I have is this one: given that one service gives me a 80ms ping
(pretty consistantly) and another one gives me 30ms (again very
consistently), is this 50ms difference enough to impact perceived call
quality? 

Or will the quality be impossible to differenciate, and I should choose
based on some other criteria? (customer service, price, etc)

The thing is I can`t really see a difference myself, but I am told that my
hearing isn`t that great so I should judge based on that.

While I`m here, might as well ask this: is there a decent call quality
software available that i could use to give me perceived quality metrics?



Mike

You cant go by pings.  ICMP traffic is given lowest priority on internet
routers, where voip rtp or iax might be given much higher priority.  Plus I have
2 providers, the provider with the 90ms ICMP ping time is way better than the
provider with the 15ms ping time.  It depends on so many factors, including
their equipment.  I have a continuing problem with the voice dropping out for 1
second or less during a call and both providers have this problem but I
haven't been able to figure out where the problem is coming from, inside my
network they are on their own lan and the sound is great but using IAX or SIP to
connect to teliax or voicepulse has these damn audio dropouts, and I even tried
jitter buffer, 2 asterisk boxes, 2 different internet connections one DSL and
one cable, and various codecs and a mix and match of all this.  Anyways your
best bet is to get a pay as you go account and test....

Mike


-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Micha?l Gaudette
Sent: Tuesday, February 07, 2006 3:28 PM
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] Opinions needed on call quality vs network latency

Hi,

I am checking out the quality at a few vendors, and althought I know it
doesn`t totally reflect call quality I am using ping as a cheap subsitute to
having a real VoIP testing system

The question I have is this one: given that one service gives me a 80ms ping
(pretty consistantly) and another one gives me 30ms (again very
consistently), is this 50ms difference enough to impact perceived call
quality? 

Or will the quality be impossible to differenciate, and I should choose
based on some other criteria? (customer service, price, etc)

The thing is I can`t really see a difference myself, but I am told that my
hearing isn`t that great so I should judge based on that.

While I`m here, might as well ask this: is there a decent call quality
software available that i could use to give me perceived quality metrics?



Mike

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