Voice over GPRS?

Andreas Kostyrka andreas at kostyrka.org
Fri Feb 2 18:44:17 CET 2007


* Robert Michel <openmoko at robertmichel.de> [070202 18:26]:
> Incoming bandwidth: 	14.5 Kbps
> 0.01 Mbps
> 1.81 KBps
> 0 MBps 	
> 
> Outgoing bandwidth: 	14.5 Kibps
> 0.01 Mbps
> 1.81 KBps
> 0 MBps
> Total bandwidth (incoming and outgoing): 29 Kbps
> 0.03 Mbps
> 3.63 KBps
> 0 MBps
> 
> 29Kbps = 3.625 kByte/s

Looks nice, BUT you don't have always a 14400 bps uplink. Beside
streaming VoIP without QoS can only work with an strong oversupply of
bandwidth. In the case of GPRS you often have only 9600-14400 bps
uplink spped.

> I was not speaking about VoIP, I was talking about
> asyncron voice services like the buzzthingy
> "Push to talk" - but I do not whant to push - 
> "Talk to talk" would be more smart - no need to 
> press a button.

That seems reasonable.

> So my question would be how much delay will bring a GPRS
> connection compared with normal internet connections?

Somewhere between 300ms and 10 seconds. (I think I once that over
60seconds ping times in Munich ;) )

Andreas




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