[SIPForum-discussion] Can SIP Layer handle Fragmentation

[usman chaudhry]

Hello Guys,

    It is my understanding that SIP (RFC 3261) cannot handle fragmented packets. It is the responsibility of the lower layer protocols to do the packet reassembly i.e. for SIP via UDP it will be the IP layer that reassembles and for SIP via TCP it will be the the IP/TCP layer.
    
    Can you please confirm if there is any requirement on the SIP Stack to reassemble fragmented SIP packets (i.e. Frames).

Regards 
Usman



----- Original Message ----
From: mohab emara <mohabemara at gmail.com>
To: Stewart Bunce <Stewart.Bunce at telsis.com>
Cc: usman chaudhry <usman_chaudhry at yahoo.com>; discussion at sipforum.org
Sent: Thursday, September 11, 2008 4:36:34 AM
Subject: Re: [SIPForum-discussion] Contact Header being changed by a SIP Prxy.


Agree with Stewart, and find below the filtered data from table 2 concerning this point


Header field          where   proxy ACK BYE CAN INV OPT REG 
      ___________________________________________________________ 
      Contact                 R            o   -   -   m   o   o 
      Contact                1xx           -   -   -   o   -   - 
      Contact                2xx           -   -   -   m   o   o 
      Contact                3xx      d    -   o   -   o   o   o 
      Contact                485           -   o   -   o   o   o 

Where Bold d stands for delete only.

Br,
Mohab



On Wed, Sep 10, 2008 at 4:02 PM, Stewart Bunce <Stewart.Bunce at telsis.com> wrote:

According to Table 2: Summary of header fields, A--O in RFC3261 a Proxy 
can only modify the Contact header field in 3XX responses and even then it is 
only allowed to delete it/them not modify.
 
Stew
-----Original Message-----
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org]On  Behalf Of usman chaudhry
Sent: 10 September 2008  10:41
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Contact Header being changed by a SIP  Prxy.


Hello  All,

    According to RFC 3261 is a SIP proxy allowed to  change the Contact Header for an 
INVITE

regards
Usman.



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