I've been trying to send out SIP calls from a softphone to an outside line. the call makes it to the freeswitch box and is sent to our cisco router, but the source port is coming up as "rport" instead of 5060. In what may be a related problem when the router sends messages the freeswitch box, freeswitch does not return an ACK message. The gateway and sip profile settings are pasted below. <gateway name="main-outbound"> <param name="username" value="1000"/> <param name="realm" value="xxx.xxx.xxx.xxx"/> <param name="password" value="1234"/> <param name="register" value="false"/> <param name="caller-id-in-from" value="true"/> <param name="contact-params" value="tport=tcp"/> </gateway> <settings> <param name="debug" value="0"/> <param name="sip-trace" value="no"/> <param name="rfc2833-pt" value="101"/> <param name="sip-port" value="5060"/> <param name="dialplan" value="XML"/> <param name="context" value="public"/> <param name="dtmf-duration" value="100"/> <param name="codec-prefs" value="$${outbound_codec_prefs}"/> <param name="hold-music" value="$${hold_music}"/> <param name="use-rtp-timer" value="true"/> <param name="rtp-timer-name" value="soft"/> <param name="manage-presence" value="false"/> <param name="aggressive-nat-detection" value="true"/> <param name="inbound-codec-negotiation" value="generous"/> <param name="nonce-ttl" value="60"/> <param name="auth-calls" value="false"/> <param name="rtp-timeout-sec" value="1800"/> <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="rtp-timeout-sec" value="300"/> <param name="rtp-hold-timeout-sec" value="1800"/> </settings>