---
title: One way audio on our TrixBox
description: One way audio on our TrixBox
---

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# One way audio on our TrixBox

### Running a TrixBox behind a firewall can cause one way audio issues. On a Trixbox, you will need to specify the external IP as well as the internal network in sip.conf. ie: \[general\] externhost = asterisk.company.com externip=123.123.123.123 ; the ip address your ISP gives you localnet=192.168.1.0/255.255.255.0 nat=yes port = 5060 ; Port to bind to (SIP is 5060) bindaddr = 0.0.0.0 ; Address to bind to (all addresses on machine) disallow=all ; Modify these to meet your codec needs allow=ulaw allow=alaw allow=g729 allow=gsm

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