dead peer detection gets response not in time

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[9963]: INFO: [R-MAIN:101afc0c-a0002be-17ac-52f0dcbb-920dfef1-70bf3d82@10.0.2.190] -> Other sequential INVITE received from 74.80.226.164:5060

Reply from PBX
Feb 4 12:42:49 gw1 /usr/local/sbin/kamailio[9952]: ERROR: [R-DEFAULT-STATELESS-REPLY:101afc0c-a0002be-17ac-52f0dcbb-920dfef1-70bf3d82@10.0.2.190] !> Received stateless reply 200 (INVITE) from 108.32.57.50:6060
gmerilliAsked:
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TimotiStDatacenter TechnicianCommented:
That port number is a but suspicious: "108.32.57.50:6060". Your SIP ALG might only monitor port 5060 by default.
Standard option: any firmware updates to the router?

Tamas
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gmerilliAuthor Commented:
I understand your comment, but I actually eliminated the ALG server by putting the PBX directly on the internet and I still got the same issue.  FYI....other than this happening on toll free calls, non-toll free calls work fine.  My provider switched our toll free call carrier to another provider and the problem went away.  They have currently opened a trouble ticket with the carrier.
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gmerilliAuthor Commented:
didn't really get a solution as to why this was happening
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