18 Dec
2019
18 Dec
'19
7:10 a.m.
Thank you all for the detailed information. Let me try both changing the
transmission time and also suspending the invite transaction. That NAT port
close did not hit my mind. Thanks for putting light on that.
On Wed, 18 Dec 2019 at 9:35 AM, Patrick Wakano <pwakano(a)gmail.com> wrote:
As I understood Anuran is after the SIP retransmission
timer.
From the description, I think the first INVITE, which I assume triggers
the pushkit voip to IOS stuff, is missed, then (with default timer T1)
after 500ms the first retransmission is done, then after another 500ms you
get the 2nd, then after 1s the 3rd, after 2s the 4th, after 4s the 5th,
after 8s the 6th and finally after 16s the 7th. This is probably why if you
wait 10/15s it works, because probably the 5th or 6th retransmission hits
your client. If you wait just 5s you can fall under one window without
retransmission (if you miss the 5th you have to wait 8s for the next
retransmission).
You can change the timer T1 in the TM module and hope the retransmissions
do the job for you. It might work but doesn't look safe to me. I have no
idea how this pushkit voip event works, but you may have problems of NAT
ports being closed due to lack of SIP activity, then the INVITE will never
reach your destination anyway.
The way to go seems what David has suggested about suspending the Invite
transaction while your client start-up and register, but I don't know
details about this....
Cheers,
Patrick Wakano
On Wed, 18 Dec 2019 at 07:34, Henning Westerholt <hw(a)skalatan.de> wrote:
As mentioned, it is more a User agent related
topic. But there is a
module that provide related functions in Kamailio:
https://kamailio.org/docs/modules/stable/modules/sst.html
Cheers,
Henning
Am 17.12.19 um 19:51 schrieb Anuran Barman:
Thanks for the reply. Sharing doc links of Session timer settings related
to Kamailio specifically will be greatly appreciated.
On Wed, 18 Dec 2019 at 12:18 AM, Yuriy Gorlichenko <ovoshlook(a)gmail.com>
wrote:
Session-Expires header ( Just remembered right
name) will help you
See rfc 4028
https://tools.ietf.org/html/rfc4028#page-6
On Tue, 17 Dec 2019, 19:44 Yuriy Gorlichenko, <ovoshlook(a)gmail.com>
wrote:
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Hi. It is no a kamailio question but sip question
itself. You can
manage how often te invite will be by using session-timers. It will help
you to setup time range between reInvite ir whatever message you will use
as keepalive
On Tue, 17 Dec 2019, 19:34 Anuran Barman, <anuranbarman(a)gmail.com>
wrote:
> Hi, I am using Kamailio for my SIP Phone app. My main SIP client is
> the iOS app. Till now everything is working fine regarding the calling. But
> the problem is when the app is killed I am not able to pick up incoming
> call. The thing is, when app is killed I am sending PushKit VOIP message to
> my ios app to wake it up. App is waking up. But by the time app is waking
> up, the original INVITE message got missed up. So according to SIP protocol
> it will re-INVITE after some time. Currently if I keep my app open for
> 10-15 secs after it wakes up, I am able to get the re-INVITE and everything
> works fine just as it was supposed to. But waiting 10-15 sec on the app is
> not practical in any sense.
>
> So my question is there any way I can reduce the re-INVITE time to
> like 5/6 seconds so that as soon as the app open it will wait for 5/6
> seconds (practical upto some extent) and it will get the call ? Or what
> kamailio is using as the interval time is a SIP standard and can not be
> changed? If possible to do so, how can I do that? Please help.
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