Re: [OpenSIPS-Users] Opensips Packet Size Issue

Mon, 25 Jan 2016 04:14:08 -0800 

Hi Jai,
I came across some OSes (like RH) which do not deliver to the app level (to opensips) UDP packets with missing fragments - in other words, if the UDP packet (with the 183 reply) was fragmented into multiple IP packets (by the TCP/IP stack on FS machine) and only the first fragment (one IP packet market with flag "Fragments to Follow") is received by the TCP/IP stack of the OpenSIPS machine, the stack will discard the packet and not deliver to OpenSIPS at all. 


It is the worst combination - sender doing bad defragmentation with a 
receiver very strict in receiving all fragments.


Check via pcap to see if it is your case.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 24.01.2016 00:12, Jai Rangi wrote:

Hello,


I have two opensip servers, exactly same configuration, but one is 
acting different. This is the call  flow.

Origination -- Invite------------> Opensips
Origination < 100 Trying ------ Opensips

 ---------------------------------------Opensips ----invite --> End 
user (freeswitch)
----------------------------------------Opensips <--- 100 trying -- 
Freeswitch
----------------------------------------Opensips <-- 183 Ringing -- 
Freeswitch

Keeps waiting and never forward 183 back to Origination.

While 2nd opensips works just fine/

MTU is 1500 on both.
Working Server versions
Centos 5.2, Openisps 11-2

Not working, version (Different OS, same version of Opensips)
Cent OS 5.4, Opensips 11-2


Below is the full trace. Any hint to fix this will big help. I am 
suspecting fragmented packet size in 183 Session Progress, but not 
sure how to fix it. If the packet is not fragmented all works fine.


This is original trace, ALL IPs has been modified for security.


15.43.72.36:5060 <http://15.43.72.36:5060> -> 29.16.115.170:5060 
<http://29.16.115.170:5060>
INVITE 
sip:[email protected]:5060;user=phone;transport=UDP;maddr=29.16.115.170 
SIP/2.0.
v: SIP/2.0/UDP 
15.43.72.36:5060;branch=z9hG4bKa83557bc149a92c4dd2e82551235a4d3.35f93e16.

Record-Route: <sip:15.43.72.36:5060;lr>.

Remote-Party-ID: <sip:[email protected] 
<mailto:sip%3A%[email protected]>>;screen=yes;party=calling;privacy=off.
f: 
<sip:[email protected]:5060;user=phone>;tag=-45026-1a697ef-67d2935e-1a697ef.

t: <sip:[email protected]:5060;user=phone>.
i: b3338bd0185eadc713c41a697ef72c17e921839f4f01a344bb8-0091-7406.
CSeq: 1 INVITE.
Allow: ACK,BYE,CANCEL,INVITE,OPTIONS,INFO,SUBSCRIBE,REFER,NOTIFY,PRACK.

v: SIP/2.0/UDP 
52.88.1.5:5060;branch=z9hG4bK0cba239efe292bb148db0d60f1938f42.4937234e;received=52.88.1.5.
v: SIP/2.0/UDP 
IRW6:5060;maddr=19.73.4.24;branch=z9hG4bK-1a697ef-72c17e92-7809c98f;received=19.73.94.24.

Max-Forwards: 15.
m: <sip:19.73.4.24:5060;transport=UDP>.
k: 100rel, resource-priority, replaces.
c: application/sdp.
l: 235.
Record-Route: <sip:52.88.1.5;lr>.
.
v=0.
o=PVG 1453494628460 1453494628460 IN IP4 199.173.133.17.
s=-.
p=+1 6135555555.
c=IN IP4 199.173.133.17.
t=0 0.
m=audio 34552 RTP/AVP 18 0 8 101.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=fmtp:18 annexb=no.

#

U 29.16.115.170:5060 <http://29.16.115.170:5060> -> 15.43.72.36:5060 
<http://15.43.72.36:5060>

SIP/2.0 100 Giving a try.

v: SIP/2.0/UDP 
15.43.72.36:5060;branch=z9hG4bKa83557bc149a92c4dd2e82551235a4d3.35f93e16.
f: 
<sip:[email protected]:5060;user=phone>;tag=-45026-1a697ef-67d2935e-1a697ef.

t: <sip:[email protected]:5060;user=phone>.
i: b3338bd0185eadc713c41a697ef72c17e921839f4f01a344bb8-0091-7406.
CSeq: 1 INVITE.

v: SIP/2.0/UDP 
52.88.1.5:5060;branch=z9hG4bK0cba239efe292bb148db0d60f1938f42.4937234e;received=52.88.1.5.
v: SIP/2.0/UDP 
IRW6:5060;maddr=19.73.4.24;branch=z9hG4bK-1a697ef-72c17e92-7809c98f;received=19.73.94.24.

Server: Opensips SIP Gateway.
Content-Length: 0.
.

#

U 29.16.115.170:5060 <http://29.16.115.170:5060> -> 28.3.8.20:5060 
<http://28.3.8.20:5060>

INVITE sip:[email protected]:5060;user=phone;transport=UDP SIP/2.0.

Record-Route: 
<sip:29.16.115.170;lr;ftag=-45026-1a697ef-67d2935e-1a697ef;did=c63.65dae2a5>.

Via: SIP/2.0/UDP 29.16.115.170:5060;branch=z9hG4bK3a79.ead0d7c5.0.

v: SIP/2.0/UDP 
15.43.72.36:5060;branch=z9hG4bKa83557bc149a92c4dd2e82551235a4d3.35f93e16.

Record-Route: <sip:15.43.72.36:5060;lr>.

Remote-Party-ID: <sip:[email protected] 
<mailto:sip%3A%[email protected]>>;screen=yes;party=calling;privacy=off.
f: 
<sip:[email protected]:5060;user=phone>;tag=-45026-1a697ef-67d2935e-1a697ef.

t: <sip:[email protected]:5060;user=phone>.
i: b3338bd0185eadc713c41a697ef72c17e921839f4f01a344bb8-0091-7406.
CSeq: 1 INVITE.
Allow: ACK,BYE,CANCEL,INVITE,OPTIONS,INFO,SUBSCRIBE,REFER,NOTIFY,PRACK.

v: SIP/2.0/UDP 
52.88.1.5:5060;branch=z9hG4bK0cba239efe292bb148db0d60f1938f42.4937234e;received=52.88.1.5.
v: SIP/2.0/UDP 
IRW6:5060;maddr=19.73.4.24;branch=z9hG4bK-1a697ef-72c17e92-7809c98f;received=19.73.94.24.

Max-Forwards: 14.
m: <sip:19.73.4.24:5060;transport=UDP>.
k: 100rel, resource-priority, replaces.
c: application/sdp.
l: 235.
Record-Route: <sip:52.88.1.5;lr>.
.
v=0.
o=PVG 1453494628460 1453494628460 IN IP4 199.173.133.17.
s=-.
p=+1 6135555555.
c=IN IP4 199.173.133.17.
t=0 0.
m=audio 34552 RTP/AVP 18 0 8 101.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
a=ptime:20.
a=fmtp:18 annexb=no.

#####

U 28.3.8.20:5060 <http://28.3.8.20:5060> -> 29.16.115.170:5060 
<http://29.16.115.170:5060>

SIP/2.0 100 Trying.
Via: SIP/2.0/UDP 29.16.115.170:5060;branch=z9hG4bK3a79.ead0d7c5.0.

Via: SIP/2.0/UDP 
15.43.72.36:5060;branch=z9hG4bKa83557bc149a92c4dd2e82551235a4d3.35f93e16.
Via: SIP/2.0/UDP 
52.88.1.5:5060;branch=z9hG4bK0cba239efe292bb148db0d60f1938f42.4937234e;received=52.88.1.5.
Via: SIP/2.0/UDP 
IRW6:5060;maddr=19.73.4.24;branch=z9hG4bK-1a697ef-72c17e92-7809c98f;received=19.73.94.24.
Record-Route: 
<sip:29.16.115.170;lr;ftag=-45026-1a697ef-67d2935e-1a697ef;did=c63.65dae2a5>.

Record-Route: <sip:15.43.72.36:5060;lr>.
Record-Route: <sip:52.88.1.5;lr>.

From: 
<sip:[email protected]:5060;user=phone>;tag=-45026-1a697ef-67d2935e-1a697ef.

To: <sip:[email protected]:5060;user=phone>.
Call-ID: b3338bd0185eadc713c41a697ef72c17e921839f4f01a344bb8-0091-7406.
CSeq: 1 INVITE.
User-Agent: FreeSWITCH-mod_sofia/1.2.12+git~20130816T225403Z~8566ffa82a.
Content-Length: 0.
.

##########################
###############################

U 28.3.8.20:5060 <http://28.3.8.20:5060> -> 29.16.115.170:5060 
<http://29.16.115.170:5060>

SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP 29.16.115.170:5060;branch=z9hG4bK3a79.ead0d7c5.0.

Via: SIP/2.0/UDP 
15.43.72.36:5060;branch=z9hG4bKa83557bc149a92c4dd2e82551235a4d3.35f93e16.
Via: SIP/2.0/UDP 
52.88.1.5:5060;branch=z9hG4bK0cba239efe292bb148db0d60f1938f42.4937234e;received=52.88.1.5.
Via: SIP/2.0/UDP 
IRW6:5060;maddr=19.73.4.24;branch=z9hG4bK-1a697ef-72c17e92-7809c98f;received=19.73.94.24.
Record-Route: 
<sip:29.16.115.170;lr;ftag=-45026-1a697ef-67d2935e-1a697ef;did=c63.65dae2a5>.

Record-Route: <sip:15.43.72.36:5060;lr>.
Record-Route: <sip:52.88.1.5;lr>.

From: 
<sip:[email protected]:5060;user=phone>;tag=-45026-1a697ef-67d2935e-1a697ef.

To: <sip:[email protected]:5060;user=phone>;tag=p5ZtZ40SSXprB.
Call-ID: b3338bd0185eadc713c41a697ef72c17e921839f4f01a344bb8-0091-7406.
CSeq: 1 INVITE.
Contact: <sip:[email protected]:5060;transport=udp>.
User-Agent: FreeSWITCH-mod_sofia/1.2.12+git~20130816T225403Z~8566ffa82a.
Accept: application/sdp.

Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, 
REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE.

Supported: timer, precondition, path, replaces.

Allow-Events: talk, hold, conference, presence, dialog, line-seize, 
call-info, sla, include-session-description, presence.winfo, 
message-summary, refer.

Content-Type: application/sdp.
Content-Disposition: session.
Content-Length: 249.

Remote-Party-ID: "13033334444" <sip:[email protected] 
<mailto:sip%[email protected]>>;party=calli

# // Fragmented packet second part
U 28.3.8.20 -> 29.16.115.170 +32125@1480:277
ng;privacy=off;screen=no.
.
v=0.
o=FreeSWITCH 1453563985 1453563986 IN IP4 28.3.8.20.
s=FreeSWITCH.
c=IN IP4 28.3.8.20.
t=0 0.
m=audio 21814 RTP/AVP 0 101.
a=rtpmap:0 PCMU/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
a=ptime:20.

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