Hi, Yesterday, one of my asterisk servers was hung... On the log, I found these: May 2 09:38:26 DEBUG[28201] rtp.c: RTP Transmission error of packet 50596 to <ip address>:16480: Network is unreachable May 2 09:38:29 WARNING[17120] chan_sip.c: sip_xmit of 0x81f60b8 (len 396) to <ip address>:5060 returned -1: Network is unreachable These messages above exist for each devices that are registered to asterisk server. After I restarted the asterisk server, the problem was gone. What did caused this? I'm running asterisk 1.2.7.1 on Redhat EL4 Regards, Stevanus