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?
Regards
Bastian
On October 31, 2004 05:36 pm, Bastian Schern wrote:> 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?As far as I am aware there is no such thing as a fragmented UDP packet; each packet is sent out on its own, there is no coherency between UDP packets like there is with TCP packets. I could be very wrong here, it's been a late night with the kids. :-) -A.
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...).