Depends on the carrier. Verizon Wireless appears to activly block SIP. G729 codec is needed on 3G and is a good idea on 4G. I use TLS and SRTP to work around carrier stupidity. I also use a non-standard port for TLS. It mostly works much of the time. Don’t get BRIA, every time your registration is dropped it will popup a notification.
From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Tech Dude Sent: Friday, July 18, 2014 1:00 PM To: asterisk-users@lists.digium.com Subject: [asterisk-users] VoIP over 3G/4G Data What are the recommended settings to successfully implement VoIP over 3G/4G data connection. Assume we are talking about using Polycom phones, and the 3G/4G data connection comes from a Cradlepoint router that is plugged in with AC power and has high gain antennas. The device will be stationary, so we will not have to worry about tower handoff’s breaking the connection. This will be for fixed wireless. I have read to use G.729 codec, and TCP for signaling to bypass firewalls. Besides that, what other settings are recommended? Changes in MTU? Changes in voice payload ms? Is there a better codec to use? Header compression?
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