[Asterisk-Users] UDP Fragmentation Problem

[Rich Adamson]

> 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...).

Fragmentation shouldn't make any difference as the sip/rtp/g711 packets 
are roughly 250 bytes anyway.