I got a freeswitch that is behind nat and got three profiles. External (all calls are going through a proxy): <param name="rtp-ip" value="$${local_ip_v4}"/> <param name="sip-ip" value="$${local_ip_v4}"/> <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> <param name="ext-sip-ip" value="$${external_sip_ip}"/> <param name="local-network-acl" value="localnet.auto"/> Internal (phones on the same lan as FS) <param name="rtp-ip" value="$${local_ip_v4}"/> <param name="sip-ip" value="$${local_ip_v4}"/> <param name="local-network-acl" value="localnet.auto"/> Wan (phones that are not in the same LAN, connecting from internet) <param name="rtp-ip" value="$${local_ip_v4}"/> <param name="sip-ip" value="$${local_ip_v4}"/> <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> <param name="ext-sip-ip" value="$${external_sip_ip}"/> <param name="local-network-acl" value="localnet.auto"/> The problem is that phones registered on the internal profile gets RECOVERY_ON_TIMER_EXPIRE error after 40-60 seconds. Audio works fine in all profiles. Log from a call: http://pastebin.freeswitch.org/11303 I'm running freeswitch with the -nonat option.