[Asterisk-Users] UDP Fragmentation Problem

[Julio Arruda]

Bastian Schern wrote:
> Hi everybody,
> 
> I've got no success to get a friend in Bogota (Colombia) connected to my 
> Asterisk. He has got a ISDN Internet connection and the UDP packets will 
> be fragmented. It seems that the MTU of this connection is round about 
> 400 to 500 Bytes. Therefore most UDP-SIP packages are fragmented.
> Is Asterisk not able to handle fragmented UDP packages?
> Is it possible to use SIP over TCP with X-Lite?
> Or has somebody another hint for me?
> 

Fragmentation should not matter for the end-point (the source or 
destination of the UDP datagram), since the IP stack itself should take 
care of the reassembly..
But....it is quite weird they have such a small MTU. Many websites that 
have problems with Path MTU discovery would be broken by that (dumb 
websites, but still, way too many...).