28 Mar
2011
28 Mar
'11
7:34 p.m.
Hi Klaus:
thanks.
On 03/28/2011 12:15 PM, Klaus Darilion wrote:
Does ngrep really show the difference to the previous
captured packet
which mathces the filter, or to any previous packet?
the ngrep man page shows:
-T Print a timestamp in the form of +S.UUUUUU, indicating the
delta between packet matches.
If I understand it correctly, it is the delta between two packets?
Further, you have to inspect the Via branch parameter.
Maybe the second
INVITE is not a retransmission (same branch parameter) but a second
branch (different branch parameter)
the compelete two invites are here, I did not see the difference of
these two via branch.
(xxx is some ip address.)
#
U +0.001936 xxx.17:5060 -> xxx.16:5060
INVITE sip:224@172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.
Record-Route:
<sip:xxx.17;lr;ftag=kj456jkt2b;did=907.bb779af2;rqu=WkNGWWUlHxdHS0RDaEpNJxtOWlotaUR0UkFcFjl/TA-->.
Record-Route: <sip:xxx.16;lr;ftag=kj456jkt2b;n=2>.
Via: SIP/2.0/UDP xxx.17;branch=z9hG4bKd37a.2a8e7037.0.
Route: <sip:xxx.16;lr;received="sip:xxx.3:2057">.
Via: SIP/2.0/UDP xxx.16;branch=z9hG4bKd37a.db97e707.0.
Via: SIP/2.0/UDP
172.16.8.48:2048;received=xxx.3;branch=z9hG4bK-arncrc8u5vji;rport=2048.
From: "Anonymous" <sip:anonymous@anonymous.invalid>;tag=kj456jkt2b.
To: <sip:%23224@demo-sip.centercall.com;user=phone>.
Call-ID: 3c2e31dee22b-yl0mwzs6z9ij.
CSeq: 2 INVITE.
Max-Forwards: 20.
Contact: <sip:225@xxx.3:2048;line=27vlv3wh>;flow-id=1.
P-Key-Flags: resolution="31x13", keys="4".
User-Agent: snom360/7.1.33.
Accept: application/sdp.
Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE,
PRACK, MESSAGE, INFO.
Allow-Events: talk, hold, refer, call-info.
Supported: timer, 100rel, replaces, from-change.
Session-Expires: 3600;refresher=uas.
Min-SE: 90.
Content-Type: application/sdp.
Content-Length: 426.
X-Remote-IP: xxx.3:2048.
X-NAT: Yes.
X-NAT: Yes.
X-RTP-PROXY-SET: 0.
.
v=0.
o=root 1879428310 1879428310 IN IP4 xxx.3.
s=call.
c=IN IP4 xxx.3.
t=0 0.
m=audio 62730 RTP/AVP 0 8 101.
a=crypto:1 AES_CM_128_HMAC_SHA1_32
inline:Z3ntA6fyR4ZPiFURrxuZL/WEBoDWPorK3uKc1SCb.
a=rtpmap:0 pcmu/8000.
a=rtpmap:8 pcm
#
U +0.000013 xxx.17:5060 -> xxx.16:5060
INVITE sip:224@172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.
Record-Route:
<sip:xxx.17;lr;ftag=kj456jkt2b;did=907.bb779af2;rqu=WkNGWWUlHxdHS0RDaEpNJxtOWlotaUR0UkFcFjl/TA-->.
Record-Route: <sip:xxx.16;lr;ftag=kj456jkt2b;n=2>.
Via: SIP/2.0/UDP xxx.17;branch=z9hG4bKd37a.2a8e7037.0.
Route: <sip:xxx.16;lr;received="sip:xxx.3:2057">.
Via: SIP/2.0/UDP xxx.16;branch=z9hG4bKd37a.db97e707.0.
Via: SIP/2.0/UDP
172.16.8.48:2048;received=xxx.3;branch=z9hG4bK-arncrc8u5vji;rport=2048.
From: "Anonymous" <sip:anonymous@anonymous.invalid>;tag=kj456jkt2b.
To: <sip:%23224@demo-sip.centercall.com;user=phone>.
Call-ID: 3c2e31dee22b-yl0mwzs6z9ij.
CSeq: 2 INVITE.
Max-Forwards: 20.
Contact: <sip:225@xxx.3:2048;line=27vlv3wh>;flow-id=1.
P-Key-Flags: resolution="31x13", keys="4".
User-Agent: snom360/7.1.33.
Accept: application/sdp.
Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE,
PRACK, MESSAGE, INFO.
Allow-Events: talk, hold, refer, call-info.
Supported: timer, 100rel, replaces, from-change.
Session-Expires: 3600;refresher=uas.
Min-SE: 90.
Content-Type: application/sdp.
Content-Length: 426.
X-Remote-IP: xxx.3:2048.
X-NAT: Yes.
X-NAT: Yes.
X-RTP-PROXY-SET: 0.
.
v=0.
o=root 1879428310 1879428310 IN IP4 xxx.3.
s=call.
c=IN IP4 xxx.3.
t=0 0.
m=audio 62730 RTP/AVP 0 8 101.
a=crypto:1 AES_CM_128_HMAC_SHA1_32
inline:Z3ntA6fyR4ZPiFURrxuZL/WEBoDWPorK3uKc1SCb.
a=rtpmap:0 pcmu/8000.
a=rtpmap:8 pcm
Kind regards / Mit freundlichen Grüßen
Min Wang
regards
klaus
Am 28.03.2011 17:43, schrieb Min Wang:
--
Kind regards / Mit freundlichen Grüßen
Min Wang
BASIS AUDIONET
North America
BASIS AUDIONET * 716 N. Bethlehem Pike - Suite 300 * Lower Gwynedd * PA 19002 * USA
Phone +1 215 674 8600 ext 451
Fax +1 215 646 4959
wang(a)basis-audionet.com
www.basis-audionet.com
Europe
BASIS AUDIONET GmbH * Jessenstraße 4 * 22767 Hamburg * Germany
Phone +49 40 85 31 14-0
Fax +49 40 85 31 14-33
www.basis-audionet.de
Registered: Hamburg HR B 85866
Managing Director: Lutz Schaffhausen, Rüdiger Kaun
HI
I did the trace using ngrep:
ngrep -T -W byline -d any port 5060
And I am confused with tm retran.
(1) case one
tm module, the|retr_timer1| default is 500 ms.
#U +0.001824 xxx.17:5060 -> xxx.16:5060
INVITE sip:224@172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.
#U +0.000012 xxx.17:5060 -> xxx.16:5060
INVITE sip:224@172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.
the ngrep show the delta between packet, the second invite is only 12
ms behind?
is my understanding correct?
(2) change retr_timer1 to 2000 ms
modparam("tm", "retr_timer1", 1000)
#U +0.001936 xxx.17:5060 -> xxx.16:5060
INVITE sip:224@172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.
#U +0.000013 xxx.17:5060 -> xxx.16:5060
INVITE sip:224@172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.
the delta still 13 ms behind, so similar to the case 1,
The question is: is the second invite the re-trans by tm?
If so why it is around 12/13 ms? not the 500 ms or as configured 2000 ms?
thanks.
Kind regards / Mit freundlichen Grüßen
Min Wang
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