SIP registration period

[bridonca]

I was playing around with one of my problem phones, a Pirelli DP L10, and for the longest time, I could not get incoming calls on that phone. I could when I turned it on, but after it was on for a while, no incoming. It took me a while, but I figured it out. My router's NAT would only hold onto the registration for 120 seconds, and most sip registration periods like freephoneline are set for 3600 seconds. I set the SIP registration period on my Pirelli DP L10 to 119 seconds and I can now get incoming calls consistently.