i believe the latency you said is far less than that incurred by user interaction to answer a call.
once the call is established, sip does not contribute to any latency or voice quality. as for NAT issue, ICE can help solve the issue. NAT is not specific to SIP. if you believe that other signaling protocols leveraging on TCP or any reliable transport protocol can eliminate NAT concern, you should also believe in SIP -- SIP works with TCP/TLS, too :) On Apr 4, 8:39 am, David Ashwood <[email protected]> wrote: > 5 sip messages on a connection that can have high latency.... > Very similar to the ssl lag issues you can experience on mobile connections. > > Something that people often misunderstand is that many operators have > a NAT'd address space for data users - which can cause issues with SIP > when it's not factored in correctly or implemented well. > > On 4 April 2010 17:33, HeHe <[email protected]> wrote: > > > > > sip is a signaling protocol. in most cases it needs only 5 sip msgs to > > establish a call. i don't think sip alone can affect voip quality -_- > > > On Apr 4, 6:15 am, David Ashwood <[email protected]> wrote: > >> Not specific to sipDrioid - but I've used a few voip clients on the N1 > >> without any major issues. SIP is an inherently noisy protocol > >> compared to IAX - so you might be seeing other issues affecting > >> quality. SIP doesn't require a public IP address - there are a > >> variety of implementations that get around NAT'ing issues. > > >> I'm still hoping & waiting for a Google Talk invite to see how it > >> compares to the other mainstream providers - Fring & Skype. > > >> On 4 April 2010 13:52, Andy Burns <[email protected]> wrote: > > >> > JP wrote: > > >> >> SipDroid to my knowledge only works with a single provider. It also > >> >> does not offer the capability to be connected to a PBX such as > >> >> Asterisk. > > >> > I have successfully used sipdroid (over WiFi) to an asterisk PBX, call > >> > quality seemed fine. I would say I haven't used it for long enough yet > >> > to > >> > spot any potential problems. > > >> > -- > >> > You received this message because you are subscribed to the Google Groups > >> > "Android Discuss" group. > >> > To post to this group, send email to [email protected]. > >> > To unsubscribe from this group, send email to > >> > [email protected]. > >> > For more options, visit this group at > >> >http://groups.google.com/group/android-discuss?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Android Discuss" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group > > athttp://groups.google.com/group/android-discuss?hl=en. -- You received this message because you are subscribed to the Google Groups "Android Discuss" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/android-discuss?hl=en.
