when i mentioned "...not be able to receive incoming calls..", i was not thinking about "just server->client streaming". Mike, you knew it :)
what is your mobile service provider? the sentence "IP address changes are probably pretty rare" looks strange to a T-Moble user like me. at least i find my G1 ip frequently changes :( On May 10, 10:47 am, mike <enervat...@gmail.com> wrote: > On 05/10/2010 10:24 AM, HeHe wrote: > > > i was not thinking about media. > > > i guess the reason why sipdroid+TCP+pbxes can lower battery use is to > > enlarge sip registration expiration, eg. to 5 minutes or longer. what > > if mobile service provider changes phone IP earlier than 5 min when > > the provider finds no traffic to/from the phone? it will not be able > > to receive incoming calls without re-registration. > > > anyway, i am just guessing. do you know the usual (or by default) > > registration expiration between sipdroid and pbxes? > > Again, if this is just server->client streaming this is yet another > reason to avoid SIP and look at RTSP. SIP is a rendezvous protocol, > and all rendezvous protocols are complicated, with lots of things to > consider. > > AFAIK -- it's been a long time -- SIP registrations can be very long > lasting. Unless something has actually changed -- like your IP address > moved -- it shouldn't be a problem. I'm not entirely convinced that this > is a huge issue anyway because the cellular guys are probably moving > you around at L2 for the most part (again, it's been a long time since I've > paid attention to the 3gpp guys), so IP address changes are probably > pretty rare. I have no idea if anybody's been deploying mobile IP which > would more directly solve this issue. > > Mike, who used to like to make fun of Henning, Cullen and Jonathan and > many others in the SIP WG because of SIP's complexity. > > > > > > > On May 10, 9:32 am, mike<enervat...@gmail.com> wrote: > > >> On 05/10/2010 09:04 AM, HeHe wrote: > > >>> i saw this in sipdroid project FAQ: > > >>> "Sipdroid now uses TCP for the signaling connection and keeps the > >>> corresponding port open." > > >>> does anyone know how peer servers of sipdroid handle scalability when > >>> there are a million of sipdroid clients connecting with the servers > >>> using TCP? > > >>> as i observed, T-mobile Intermittently changes IP of my G1 phone > >>> without any notice, which in fact tears down the TCP connection. > > >> Remember that SIP doesn't actually transport the media, that's > >> RTP which is over UDP. So losing the connection shouldn't generally > >> be any worse than losing a http connection generally. > > >> As far as scalability, I woudn't worry about that too much. UDP > >> based SIP suffers from a lot of problems, not the least of which is > >> the lack of security (unless you manage to find DTLS or are running > >> it over IPsec). And of course NAT's are tricky as I mentioned before. > > >> But I still haven't heard why RTSP wouldn't be a better choice if > >> this is just server->client streaming. SIP is a kitchen sink of a > >> protocol. > > >> Mike > > >>> On May 9, 10:14 pm, "Nandan ."<bhavesh2...@gmail.com> wrote: > > >>>> yaa android cod support *sip stack s*uch as mjsip, now pjsip is already > >>>> ported in android platform. > > >>>> i can refer you just see sipdroid project. > >>>> sipdroid.org > > >>>> you can use rtpsender and reciver java file of sipdroid project of media > >>>> folder. > > >>>> bhavesh > > >>>> On Mon, May 10, 2010 at 3:24 AM, mike<enervat...@gmail.com> wrote: > > >>>>> On 05/06/2010 01:24 AM, vaibhav wrote: > > >>>>>> Hi > > >>>>>> When I went through the document "opencore_framework_capabilities.pdf" > >>>>>> I came to know that Android supports RTP streaming for 3gpp format. > > >>>>>> After doing a anaysis I found that the data from a server could be > >>>>>> streamed to the android device and played back. i.e the RTP payloads > >>>>>> sent from the server are parsed by the Android device and sent to the > >>>>>> decoder for playback. > > >>>>>> 1. I want to know if it is possible that the PCM data captured from a > >>>>>> camera and then encoded using a particular encoder could be streamed > >>>>>> using RTP from android code i.e is RTP sender support present in the > >>>>>> Android code ?. If not then can someone please mention what could be > >>>>>> the possible modifications required. > > >>>>>> 2. Does Android code support SIP stack ?. > > >>>>> I assume that know that RTP is the actual media payloads, and that SIP > >>>>> is the rendezvous protocol to facilitate setting up the RTP listeners > >>>>> via > >>>>> an SDP announcement? > > >>>>> That said, it sounds like you ought to look into RTSP if what you're > >>>>> trying > >>>>> to do is just stream. SIP is very, very complicated in comparison, and > >>>>> has > >>>>> all kinds of issues surrounding NAT's that are likely to just confuse > >>>>> the > >>>>> issue if all you're trying to do is Server->Client streaming. > > >>>>> Mike > > >>>>> -- > >>>>> You received this message because you are subscribed to the Google > >>>>> Groups "Android Developers" group. > >>>>> To post to this group, send email to android-developers@googlegroups.com > >>>>> To unsubscribe from this group, send email to > >>>>> android-developers+unsubscr...@googlegroups.com<android-developers%2Bunsubs > >>>>> cr...@googlegroups.com> > >>>>> For more options, visit this group at > >>>>>http://groups.google.com/group/android-developers?hl=en > > >>>> -- > >>>> B!-!/-\\/!=$!-! > > >>>> -- > >>>> You received this message because you are subscribed to the Google > >>>> Groups "Android Developers" group. > >>>> To post to this group, send email to android-developers@googlegroups.com > >>>> To unsubscribe from this group, send email to > >>>> android-developers+unsubscr...@googlegroups.com > >>>> For more options, visit this group > >>>> athttp://groups.google.com/group/android-developers?hl=en > > >> -- > >> You received this message because you are subscribed to the Google > >> Groups "Android Developers" group. > >> To post to this group, send email to android-developers@googlegroups.com > >> To unsubscribe from this group, send email to > >> android-developers+unsubscr...@googlegroups.com > >> For more options, visit this group > >> athttp://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com > For more options, visit this group > athttp://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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