2 questions about background mode (IOS)
Hello all,
i am working on an iPhone/iPad client and it is about to be finalized soon.
however i am having issues with the background mode. i would be glad if you
can clarify these issues:
a- When the mobile device switches transport medium (3G / WiFi / Edge) i
believe a re-registration needs to be sent to the sip server with the new
info. But how do i know if transport medium is changed programatically? is
there a pjsip callback for this or an IOS callback and what is it?
b- in the sample ipjsua code there is a function
- (void)keepAlive {
if (!pj_thread_is_registered())
{
pj_thread_register("ipjsua", a_thread_desc, &a_thread);
}
keepAliveFunction(KEEP_ALIVE_INTERVAL);
}
as i understand, this function fires every 600 seconds (the least amount of
time allowed by IOS). what should we put in this keepAliveFunction?? my
guess is we need to 1) re-subscribe for buddy presence 2) re-register to
server and 3) re-publish for our presence. IS there a sample
keepAliveFunction that i can look at?
Thank you,
Aytunc Isseven
Hi,
Here is my suggestions
for a - implement network reachability call back function for monitoring
mobile device switches.
Yes you need to re-register pjsip when mobile device switches transport
medium.
for b- though keepAlive function fires for every 10 mins. SIP registration
happens as soon as it is going to expires. ex: if the UA is going to
expires in 120 seconds and the app is in background, SIP Stack sends
re-registration in 120 seconds.
You need to use TCP transport to work your app in background.
Don't forget to set "Required background modes" -> "App Provides Voice over
IP services" in Info.plist
On Fri, May 4, 2012 at 8:34 PM, Aytunc Aytunc aytunch@gmail.com wrote:
Hello all,
i am working on an iPhone/iPad client and it is about to be finalized
soon. however i am having issues with the background mode. i would be glad
if you can clarify these issues:
a- When the mobile device switches transport medium (3G / WiFi / Edge) i
believe a re-registration needs to be sent to the sip server with the new
info. But how do i know if transport medium is changed programatically? is
there a pjsip callback for this or an IOS callback and what is it?
b- in the sample ipjsua code there is a function
- (void)keepAlive {
if (!pj_thread_is_registered())
{
pj_thread_register("ipjsua", a_thread_desc, &a_thread);
}
keepAliveFunction(KEEP_ALIVE_INTERVAL);
}
as i understand, this function fires every 600 seconds (the least amount
of time allowed by IOS). what should we put in this keepAliveFunction?? my
guess is we need to 1) re-subscribe for buddy presence 2) re-register to
server and 3) re-publish for our presence. IS there a sample
keepAliveFunction that i can look at?
Thank you,
Aytunc Isseven
Visit our blog: http://blog.pjsip.org
pjsip mailing list
pjsip@lists.pjsip.org
http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org
--
Ramu
Hello,
For the first point, you can read the Roberto Perez' question (16/04)
and the Benny's answer (17/04):
https://trac.pjsip.org/repos/wiki/IPAddressChange
Regarding the second point, you can find the keepAliveFunction function
in pjsua_app.c (line 158)
Best regards
Samuel
Le 04/05/12 17:04, Aytunc Aytunc a écrit :
Hello all,
i am working on an iPhone/iPad client and it is about to be finalized
soon. however i am having issues with the background mode. i would be
glad if you can clarify these issues:
a- When the mobile device switches transport medium (3G / WiFi / Edge)
i believe a re-registration needs to be sent to the sip server with
the new info. But how do i know if transport medium is changed
programatically? is there a pjsip callback for this or an IOS callback
and what is it?
b- in the sample ipjsua code there is a function
- (void)keepAlive {
if (!pj_thread_is_registered())
{
pj_thread_register("ipjsua", a_thread_desc, &a_thread);
}
keepAliveFunction(KEEP_ALIVE_INTERVAL);
}
as i understand, this function fires every 600 seconds (the least
amount of time allowed by IOS). what should we put in this
keepAliveFunction?? my guess is we need to 1) re-subscribe for buddy
presence 2) re-register to server and 3) re-publish for our presence.
IS there a sample keepAliveFunction that i can look at?
Thank you,
Aytunc Isseven
Visit our blog: http://blog.pjsip.org
pjsip mailing list
pjsip@lists.pjsip.org
http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org