I have an Vertical Xcelerator IP VOIP phone system behind a cisco RV220w router/firewall. All toll free calls are being dropped after 16 minutes. toll calls do not experience this behavior. The trace shows that the carrier is sending a DPD re-invite but the PBX is not responding until 7 seconds later. By this time the call is being torn down. The cisco RV220W has the SIP ALG active but there are no settings for this. Has anyone experienced this and is there a fix?(trace items below)
Dead peer detection INVITE
Feb 4 12:42:42 gw1 /usr/local/sbin/kamailio: INFO: [R-MAIN:firstname.lastname@example.org] -> Other sequential INVITE received from 18.104.22.168:5060
Reply from PBX
Feb 4 12:42:49 gw1 /usr/local/sbin/kamailio: ERROR: [R-DEFAULT-STATELESS-REPLY:email@example.com] !> Received stateless reply 200 (INVITE) from 22.214.171.124:6060
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