[SIPForum-discussion] what is the Maxlength of SIP?

[Herve Jourdain]

Hi,

 

In fact, it depends on your MTU¡­

The maximum size for sending a SIP request through UDP is MTU ¨C 200. If
larger, you need to send it using TCP.

If the MTU is unknown, the maximum size for sending a SIP request through
UDP is 1300.

 

But at the same time, the implementation is supposed to handle messages up
to the maximum datagram size (65535 bytes with IP and UDP headers for UDP),
because if the message is too big for UDP, but sending through TCP fails,
then it must be retried using UDP¡­

 

To be honest, I¡¯m not sure all implementations that can be found around
strictly follow these rules¡­

 

Regards,

 

Herve

 

  _____  

From: Óê ³Â [mailto:chen.yu26 at yahoo.com.cn] 
Sent: vendredi 18 janvier 2008 16:30
To: Herve Jourdain; group SIP
Subject: what is the Maxlength of SIP?

 

Hi,Herve and all in the forum,

 

How are you doing? Could you tell me the how many bytes are there in the
longest SIP message and in every header fields , BTW is it the same
situation when they are sent by UDP and TCP?

 

Regrads

 

Nora

 


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