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[asterisk-users] VoIP over 3G/4G Data


 
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colton.conor at gmail.com
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PostPosted: Fri Jul 18, 2014 11:00 am    Post subject: [asterisk-users] VoIP over 3G/4G Data Reply with quote
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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EWieling at nyigc.com
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PostPosted: Fri Jul 18, 2014 11:03 am    Post subject: [asterisk-users] VoIP over 3G/4G Data Reply with quote
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-bounces@lists.digium.com [mailto:asterisk-users-bounces@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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patrick at laimbock.com
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PostPosted: Fri Jul 18, 2014 12:02 pm    Post subject: [asterisk-users] VoIP over 3G/4G Data Reply with quote
On 18-07-14 17:59, Tech Dude wrote:
Quote:
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?

Use TLS/SRTP so the carrier can't do packet inspection/snooping and mess
with or block your VoIP connections. They might throttle/block port 5060
and 5061 anyway in which case you should use different ports.

I use Asterisk 11 with TLS/SRTP, G.722 and Android phones (4G,
CSipSimple or Bria), iPhones (4G, Bria) and Polycom phones. G.722 on
inter-office calls has been working great so no need for G.729 and
Asterisk uses standard alaw/ulaw for regular PSTN calls. I use TCP, have
made no MTU changes and use standard 20ms voice payload.

Packet loss, latency and jitter are the enemy. Your router might be top
notch but if the cell tower is overloaded and experiences too much
packet loss, delays of more than 150ms and lots of jitter than you may
get crappy sound quality. If possible, get some prepaid 4G sim cards for
your router from different carriers and test which carrier consistently
provides the best signal, least delay, packet loss and jitter.

HTH,
Patrick

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davidstahl23 at gmail.com
Guest
PostPosted: Fri Jul 18, 2014 10:39 pm    Post subject: [asterisk-users] VoIP over 3G/4G Data Reply with quote
We use standard sip ports all day long, and have had no issues with employee phones on the verzion network. On Jul 18, 2014 12:03 PM, "Eric Wieling" <EWieling@nyigc.com (EWieling@nyigc.com)> wrote:
Quote:

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-bounces@lists.digium.com (asterisk-users-bounces@lists.digium.com) [mailto:asterisk-users-bounces@lists.digium.com (asterisk-users-bounces@lists.digium.com)] On Behalf Of Tech Dude
Sent: Friday, July 18, 2014 1:00 PM
To: asterisk-users@lists.digium.com (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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