Hi.
I’ve encountered a strange behaviour. Secondary office (Mikrotik 951Ui-2nD) connected to the main (FreeBSD 9.1 MPD5) via PPTP VPN, where is placed Asterisk PBX. In second office is around 20 sip phones, most of them hanging on 5060 port. And for some reason, when disaster arrived (before it works ok), half of phones could not connect to the Asterisk. tcpdump shows no data from that phiones, but ping and even telnet to another port (80) works as expected (and visible in tcpdump). After disconnecting and reconnectiond PPPoE+PPTP on Mikrotik most of phones was connected to the Asterisk. But 3-4 phones does not. Only when I’ve changed phone SIP port to another value (5066, 5660 and some other values) they began to work. Does anybody have any idea what is it?
Try to use SIP TCP instead UDP