On Thu, 8 Mar 2012, Andrew McGlashan <andrew.mcglashan@affinityvision.com.au> wrote:
SIP is good, but hardly ever so over a mobile network in AU -- I think that carriers deliberately add latency for this reason; that is to stop you using VoIP successfully and to bypass mobile calls as much as possible.
My experience on Three and Virgin (carried by Optus) is that they don't need to deliberately add latency. The latency for data operations is bad enough to make ssh difficult at times, far worse than anything that could be used for VOIP. It seems that if the carriers were trying to discourage certain uses of their network they would want to make it bad for VOIP but good for ssh and other data applications, but this isn't happening. Also periods of total IP outage are not uncommon with Virgin. VOIP really requires a reliable connection, having no data access for periods from 30 seconds to 30 minutes really makes it unusable. While 30 minute outages are rare 30 second outages aren't. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/