[Spce-user] sip fragmentation

Jonathan Yue jonathan.yue at turboitsolutions.com
Wed Apr 13 18:09:45 EDT 2016

Thanks for your input Raúl.

in the packet captures, I notice following items:
INVITE sip:1xxxxxxxxxx at sip.voipstunt.com SIP/2.0
Via: SIP/2.0/UDP 
Via: SIP/2.0/UDP;received=;branch=z9hG4bKsdiM4aEk;rport=5080

I wonder if the 2nd record-route message and 2nd Via message are 
necessary. If they are omitted, the sip packet won't be fragmented.

------ Original Message ------
From: "Raúl Alexis Betancor Santana" <rabs at dimension-virtual.com>
To: spce-user at lists.sipwise.com
Sent: 2016-04-13 1:02:40 AM
Subject: Re: [Spce-user] sip fragmentation

>You could activate header compresion, but you will have to pray to  
>VoIPStunt to support that.
>Better check why your headers get so big
>>De: "Jonathan Yue" <jonathan.yue at turboitsolutions.com>
>>Para: spce-user at lists.sipwise.com
>>Enviados: Martes, 12 de Abril 2016 23:48:43
>>Asunto: [Spce-user] sip fragmentation
>>Hi, gang,
>>Is there a way to shrink the header of sip message sent from spce? I 
>>configured a sip trunk with VoIPStunt as a test. After receiving 
>>invite message, VoIPStunt sends 401, spce then sends out an sdp, 
>>supposedly containing authentication digest, however, the message gets 
>>fragmented. VoIPStung never responds again, apparently it doesn't 
>>assemble fragmented packets.
>>I then change the trunk's transport protocol to tcp, VoIPStunt doesn't 
>>respond at all, I guess it doesn't support tcp.
>>spce version is v4.2.1. in the attached screenshot, is 
>>VoIPStunt's ip address, the other is my spce's.
>>Spce-user mailing list
>>Spce-user at lists.sipwise.com
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