Kevin, thanks for your response.
Here is the more detailed Wireshark capture of the SIP traffic between phone
(10.0.1.57) and Asterisk (10.0.1.103). The numbers between parentheses are
Request Frames. I don't see an ACK for the 200 OK to the INVITE (491) for the
dialplan that gives us Retransmission errors (without WAIT), but there is also
no ACK for the same INVITE for the dialplan that works (with WAIT).
If you still want to take a look at the full packet capture, I'll post it.
Matt
---------------------------------------------------------------------------------------------
Without WAIT(1) - we get Retransmisson errors
486 10.0.1.57 10.0.1.103 Request: INVITE
sip:8*104_line104@10.0.1.103, with SDP
487 10.0.1.103 10.0.1.57 Status: 401 Unauthorized
490 (486) 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103
491 10.0.1.57 10.0.1.103 Request: INVITE
sip:8*104_line104@10.0.1.103, with SDP
492 10.0.1.103 10.0.1.57 Status: 100 Trying
493 10.0.1.103 10.0.1.57 Request: MESSAGE
sip:104@10.0.1.57:5060 (text/plain)
500 (for 491) 10.0.1.103 10.0.1.57 Status: 200 OK, with SDP
501 10.0.1.103 10.0.1.57 Request: NOTIFY
sip:104@10.0.1.57:5060
502 10.0.1.103 10.0.1.57 Request: CANCEL
sip:104@10.0.1.57:5060
503 (for 493) 10.0.1.57 10.0.1.103 Status: 200 OK
524 (503) 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103:5060
525 (501) 10.0.1.57 10.0.1.103 Status: 200 OK
526 10.0.1.57 10.0.1.103 Status: 487 Request Terminated
527 (for 502) 10.0.1.57 10.0.1.103 Status: 200 OK
528 (502) 10.0.1.103 10.0.1.57 Request: ACK sip:104@10.0.1.57:5060
585 (524) 10.0.1.103 10.0.1.57 Status: 200 OK, with SDP
(resend of 500)
588 (524) 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103:5060
803 (588) 10.0.1.103 10.0.1.57 Status: 200 OK, with SDP
(resend of 500)
806 (588) 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103:5060
1223 (806) 10.0.1.103 10.0.1.57 Status: 200 OK, with SDP
(resend of 500)
1229 (806) 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103:5060
2042 (1229) 10.0.1.103 10.0.1.57 Status: 200 OK, with SDP
(resend of 500)
2044 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103:5060
2886 10.0.1.103 10.0.1.57 Status: 200 OK, with SDP
2888 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103:5060
3752 10.0.1.103 10.0.1.57 Status: 200 OK, with SDP
3755 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103:5060
---------------------------------------------------------------------------------------------------------
with WAIT(1). There is no more messages beyond 672 until the call is over.
Everything is normal. There is no ACK for the OK for INVITE in 430 here either.
425 10.0.1.57 10.0.1.103 Request: INVITE
sip:8*104_line104@10.0.1.103, with SDP
426 10.0.1.103 10.0.1.57 Status: 401 Unauthorized
429 (425) 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103
430 10.0.1.57 10.0.1.103 Request: INVITE
sip:8*104_line104@10.0.1.103, with SDP
431 10.0.1.103 10.0.1.57 Status: 100 Trying
432 10.0.1.103 10.0.1.57 Request: MESSAGE
sip:104@10.0.1.57:5060 (text/plain)
443 (for 432) 10.0.1.57 10.0.1.103 Status: 200 OK
645 (for 430) 10.0.1.103 10.0.1.57 Status: 200 OK, with SDP
646 10.0.1.103 10.0.1.57 Request: NOTIFY
sip:104@10.0.1.57:5060
647 10.0.1.103 10.0.1.57 Request: CANCEL
sip:104@10.0.1.57:5060
667 (443) 10.0.1.57 10.0.1.103 Request: ACK
sip:8*104_line104@10.0.1.103:5060
668 (646) 10.0.1.57 10.0.1.103 Status: 200 OK
670 10.0.1.57 10.0.1.103 Status: 487 Request Terminated
671 (647) 10.0.1.57 10.0.1.103 Status: 200 OK
672 (for 647) 10.0.1.103 10.0.1.57 Request: ACK sip:104@10.0.1.57:5060
--------------------------------------------------------------------------------------------------------
> Date: Fri, 16 Mar 2012 10:22:49 -0500
> From: kpflem...@digium.com
> To: asterisk-users@lists.digium.com
> Subject: Re: [asterisk-users] SendText causes Retransmission errors
>
> On 03/16/2012 09:43 AM, Matt Hamilton wrote:
> > Hi,
> >
> > I'm using SendText to send a text message when the user picks up a line
> > in a SLA setup (even though I'm not sure the problem is related to SLA).
> > I'm on Asterisk 10.2.1 (same in 1.8.9)
> >
> >
> > [from-office]
> > ..
> > same => n,SendText(hi)
> > same => n,SLAStation(line1234)
> > ..
> >
> > Here is a simplified version of the SIP messages:
> >
> > 1 phone => Asterisk INVITE
> > 2 Asterisk => phone Trying
> > 3 Asterisk => phone MESSAGE
> > 4 Asterisk => phone OK (for the INVITE at 1)
> > 5 phone => Asterisk OK (for the MESSAGE at 3)
> >
> > 6 Asterisk => phone OK (for the INVITE at 1)*** RESEND of 4
> > 7 Asterisk => phone OK (for the INVITE at 1)*** RESEND of 4
> > ..
>
> Did the phone send an ACK for message 4? If not, that explains why
> Asterisk is retransmitting the '200 OK'. Posting a packet capture of
> this problem occurring would probably provide the details necessary to
> figure out what is going on.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kflem...@digium.com | SIP: kpflem...@digium.com | Skype: kpfleming
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at www.digium.com & www.asterisk.org
>
> --
> _____________________________________________________________________
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