|
I agree with your
table. So what you get is that the last transmission is after
63*T1.
Now, timer B is
set to 64*T1 when the first transmission is sent.
When timer B
expires the transaction will terminate.
This means that
the last transmission it T1 (64*T1-63*T1) before
the transaction
terminates.
This is why I think that the last transmission is a
waste.
Sarit.
It is something like this...
0 Invite sent
1st retrans T1(tme
interval) (T1) time since first
transmission after this expiry
2nd retrans
2_T1
(T1 + 2_T1) ==>> 3T1
3rd retrans
4_T1
(T1 + 2_T1 + 4_T1) ==>> 7T1
4th retrans
8_T1
(T1 + 2_T1 + 4_T1 + 8_T1)
==>> 15T1
5th retrans
16_T1
(T1 + 2_T1 + 4_T1 + 8_T1 +16_T1)
==>> 31T1
6th retrans
32_T1
(T1 + 2_T1 + 4_T1 + 8_T1 +16_T1 +
32_T1) ==>> 63T1
The actual protection time for 6th retransmission is 32*T1
not T1(which ia mentioned in sarit's mail)
----- Original Message -----
Sent: Tuesday, August 26, 2003 6:35
PM
Subject: RE: [Sip-implementors] The
seventh INVITE transmission - isn't it awaste
Sarit,
This is the
way I interpret it:-
1 INVITE sent
2 500 ms
3 1 sec
4 2
sec
5 4 sec
6 8 sec
7 16 sec
8 Timer B fires
Does this
make more sense?
Chris.
>-----Original
Message-----
>From: Sarit Galanos
[mailto:[EMAIL PROTECTED]
>Sent: 26 August 2003 13:31
>To: [EMAIL PROTECTED]
>Subject:
[Sip-implementors] The seventh INVITE transmission - isn't
it
a
>waste
>
>Hi,
>For UDP the client
transaction retransmits INVITE requests at
an
interval
>that
>starts at T1 seconds and doubles after
every retransmission.
>This should continue until timer B expires -
64*T1 msec.
>
>The result is that the seventh transmission takes
place after 63*T1
>milliseconds.
>Since T1 defaults to 500 msec,
the transaction will terminate 500 msec
>after
>the last
transmission.
>
>My question is:
>Is this the expected
behavior?
>Isn't it a waste to retransmit the request 500 msec before
the
transaction
>terminates?
>
>Regards,
>Sarit.
>
>
>
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list
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