Make these changes:
Under the SIP tab (in Voice)
NAT Support Parameters
Substitute VIA Addr: Yes
Send Resp To Src Port: Yes
STUN Enable: Yes
STUN Server: stun.xten.com
NAT Keep Alive Intvl: 30
Under the Line 1 tab
Proxy and Registration
Proxy: (change this to either us.voxalot.com or eu.voxalot.com or au.voxalot.com instead of simply voxalot.com)
Register Expires: 600
Use DNS SRV: Yes
DNS SRV Auto Prefix: Yes
(I have to admit I don't own the 3102, and I don't know what is the proper way to enter information under the PSTN Line tab. You'll probably have a better idea of the changes needed there based on the changes recommended here.)
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