> -----Original Message-----
> From: Igor Slepchin [mailto:[EMAIL PROTECTED]]
> Sent: Friday, May 18, 2001 12:56 PM
> To: 'kumar s'; '[EMAIL PROTECTED]'
> Subject: [Sip-implementors] RE: [SIP] timeout value for response
>
>
> ** Please direct future questions to sip-implementors list **
>
> Your question is answered in section 10 of 2543-bis.
>
> As specified in 10.5.1, final responses to INVITEs are
> transmitted over UDP
> up to 7 times with exponential back off from T1 to T2. Simple
> calculation
> infers that you should wait for the response for up to 19.5 seconds.
Actually, thats not quite right. If you transmit seven responses, the
intervals look like:
| | | | | | |
.5 1 2 4 4 4
The total time from the first to the last response is 4+4+4+2+1+.5 = 15.5.
So, after sending that first 200 OK, it sends the last 15.5 seconds later.
It should wait some additional time in case that last final response gets
received and triggered an ACK, say another two seconds. Thats 17.5. 19.5 is
fine as well, of course, but I just want to make sure we're clear that 15.5s
is the time between the first final response and the last.
-Jonathan R.
>
> ---
> Igor Slepchin
>
> > -----Original Message-----
> > From: kumar s [mailto:[EMAIL PROTECTED]]
> > Sent: Friday, May 18, 2001 11:22 AM
> > To: [EMAIL PROTECTED]
> > Subject: [SIP] timeout value for response
> >
> >
> > Hello All,
> >
> > what is the recommended 'timeout value' for a sipstack to
> > wait for a response.
> >
> > In particular, what is the recommended time the sipstack
> > would wait for an
> > ACK for a 200 OK.
> >
> > Thanks
> >
> > S.Kumarconfirm 748539
---
Jonathan D. Rosenberg, Ph.D. 72 Eagle Rock Ave.
Chief Scientist First Floor
dynamicsoft East Hanover, NJ 07936
[EMAIL PROTECTED] FAX: (973) 952-5050
http://www.jdrosen.net PHONE: (973) 952-5000
http://www.dynamicsoft.com
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