Hi everybody,
i'm trying to connect a sip client (LAN side) to an asterisk server (WAN side) in udp passing through an ESR-6300 router (ios-xe 17.4.1) in a pilot envinronment.
I configured the VLAN1 Ip address as the default gw of the LAN.
Without natting, everything's fine (i can register with sip from client to server).
If I set the VLAN1 as ip nat inside (with ip nat inside source static local and global addresses), the server side SIP transaction ("no auth" packet) from the server exits from the LAN side shorter then expected of 4 bytes (captured from the LAN client), and the SIP client doesn't reply because the SIP "VIA:" header contains a shorter Ip than expected (xxx.xxx.xxx instead of xxx.xxx.xxx.xxx )
I tried to set VLAN 1 and Physical interface MTU to 1514, but the problem persists: did anybody meet similar problems?
Many thanks
