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I have installed an Elastix server on a m4.large instance,but I cannot get sound on any of my calls.

The server is configured as follows: CentOS 5.9 Elastix 2.4

Using the following guide: https://thewebfellas.com/blog/how-to-install-elastix-onto-an-amazon-ec2-instance

I am able to register SIP phones, and SIP trunks. But calls are not receiving an OK signal or any audio. I tried both with specific rules for SIP and RTP ports, but the problem persists even when I open all ports.

Any idea on what I am missing?

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Lack of audio in SIP calls is nearly always due to firewall or NAT issues. All traffic to/from your EC2 instance traverses a NAT, so I'd look into making sure that the requisite NAT setting in Elastix are set properly.

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  • You were correct. Thank you, the NAT settings in the manager were not actually being implemented. I will post how I got them to work below.
    – June Lewis
    Sep 15, 2015 at 18:31
  • Great! Glad I was able to be of help.
    – EEAA
    Sep 15, 2015 at 18:31
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It looks like for some reason Elastix was ignoreing the NAT settings configured in the web interface. I resolved this by adding the following lines to /etc/asterisk/sip_nat.conf

nat=yes
externip=<your_vdc_public_ip>
localnet=192.168.0.0/255.255.255.0

Thank you to EEAA and this article that got me figured out:

http://community.voicepulse.com/articles/en_US/Article/Elastix-Template-NAT-Settings-to-Resolve-Disconnects

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