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.
In the case of SIP is imho not correct. E.g. a SIP REGISTER packet is round about 656 Bytes long.
RTP I don't know. And what is with RTP-GSM/G729 packets?
Regards
Bastian
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