[Asterisk-Users] VoIP over 1xRTT

[Kristian Kielhofner]

Deon Rodden wrote:
> For the SIP client. I just can't imagine using a SIP client over a
> connection that has 250+ ms response times. If I make it go online to the
> 802.11 networks, I can use the SIP Client with ULaw and get high quality SIP
> calls at any hotspot. I wouldn't do this for every hot spot, but it'd be a
> nice feature to have for when I'm in other countries, or I'm in an area
> where Verizon has no coverage or their reception is terrible. Maybe even a
> supplement for when I'm running low on minutes. 
> 
> When I'm at home, could use it like a Cordless phone. Work off my house
> line, which is tied in through my Asterisk server. To be honest, it's just a
> kewl feature and a neat thing to do with the phone, what can I say, I'm a
> geek like that, hehe.  The Verizon plan is coming from my work, so I don't
> want to put TOO many personal calls on it. 
> 
> Even with the EVD Network (2nd stage rollout), the ping responses are going
> to be 250+ ms. Also, I don't think these phones support 2nd stage, only
> Stage 1, 1xRTT. I'd have to get a new phone or something.
> 
> As far as the laptop, there are times when I can do things easier from my
> laptop. Full sized keyboard, access to all my documents, etc. Right now I'm
> used to plugging my laptop into my Sprint phone. So whenever I want to do
> SSH or email, I have to use the laptop. Not used to having a PDA, nor one
> that can go online on the click of a button. You're probably right, with the
> PDA features, me needing to make my laptop go online through the phone will
> probably be 5-10% of what it used to be. 
> 
> Which codec should be used for 250ms response times? G729A? 

Actually, you would want to use g711 (ulaw).  It has the least amount of 
codec-imposed latency.  I think that it is 1.5ms, while G729 is 15ms. 
Basically:

high bandwidth, high latency: g711
low bandwidth, low latency: g729

--
Kristian Kielhofner