My interval is 900 - NAT settings are beyond me but mine are set to yes - Enable and Keep Alive at top of Line 1 page also the following settings on the Sip page
Substitute VIA Addr:yes Send Resp To Src Port: yes
STUN Enable:yes STUN Test Enable: yes
STUN Server:stun.voxalot.com:3478 EXT IP:
EXT RTP Port Min: NAT Keep Alive Intvl: 15
Hope this works and also helps to power cycle SPA after changing things and also to backup your config before getting brave - Bill
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