[Freeswitch-users] SIP packet exceeds MTU?

[Ken Rice]

Switch to TCP... This is why the RFCs tell you to support both UDP and TCP
for SIP... 


On 1/9/13 9:36 AM, "Tim St. Pierre" <fs-list at communicatefreely.net> wrote:

> Hello,
> 
> I'm having a problem with BLF in some cases, and I found that the length of
> the username 
> was a factor in whether the lamps worked or not.
> 
> When I did some packet captures, I found that problem packets were 1500 bytes
> or so. 
> Since the endpoint is on a DSL line that has an MTU of 1460, the packet
> doesn't fit.
> 
> I'm already using compressed headers.  Is there a way to reduce the packet
> size more, or 
> is there another solution?  I will include an example below:  Note that my IP
> address and 
> domain substutions may change the packet size a little, but the point is the
> same.
> 
> Thanks!
> 
> NOTIFY sip:XXXX at YYY.YYY.YYY.YYY:5060;transport=udp SIP/2.0
> v:SIP/2.0/UDP zzz.zzz.zzz.zzz:5070;rport;branch=z9hG4bKD5QUr5m2Fm3Dp
> Route:<sip:aaa.aaa.aaa.aaa:61906>;transport=udp
> Max-Forwards:70
> f:<sip:accountcode-701 at ourdomain.com>;tag=TrmHE4FBIrB4
> t:"Tim St. Pierre"<sip:XXXX at ourdomain.com>;tag=ecc2498bfd
> i:3decd12decccafe1
> CSeq:448376002 NOTIFY
> m:<sip:accountcode-701 at xxx.xxx.xxx.xxx:5070;transport=udp;fs_nat=yes;fs_path=s
> ip:yyy.yyy.yyy.yyy:61906%3Btransport%3Dudp>
> User-Agent:Communicate Freely 2.0
> Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY,
> PUBLISH,SUBSCRIBE
> k:timer,precondition,path,replaces
> o:dialog
> u:talk,hold,conference,presence,dialog,line-seize,call-info,sla,include-sessio
> n-description,presence.winfo,message-summary,refer
> Subscription-State:active;expires=1137
> c:application/dialog-info+xml
> l:639
> 
> <?xml version="1.0"?>
> <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="477"
> state="partial" 
> entity="sip:accountcode-701 at ourdomain.com">
> <dialog id="accountcode-701" direction="initiator">
> <state>confirmed</state>
> <local>
> <identity 
> display="park">sip:accountcode-701 at ourdomain.com;proto=park</identity>
> <target uri="sip:accountcode-701 at ourdomain.com;proto=park">
> <param pname="+sip.rendering" pvalue="no"/>
> </target>
> </local>
> <remote>
> <identity display="park">sip:accountcode-701</identity>
> <target
> 
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
> 
> 
> 
> 
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
> 
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org

-- 
Ken
http://www.FreeSWITCH.org
http://www.ClueCon.com
http://www.OSTAG.org
irc.freenode.net #freeswitch