NatHelper
Last modified by Buildbot on 2020/10/14 13:59
Documentation based on repostory git version commit 2.0.1
Module NatHelper
The NatHelper module executes small tasks to make SIP work smoothly despite firewalls. It corrects the Contact headers that contain obviously inconsistent addresses, and adds a Record-Route to ensure subsequent requests are routed also by the proxy, through the same UDP or TCP channel used for the initial request.
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Configuration options:
| Name | Description | Default Value | Type |
|---|---|---|---|
| enabled | Indicate whether the module is activated. | true | Boolean |
| filter | A request/response enters module if the boolean filter evaluates to true. Ex: from.uri.domain contains 'sip.linphone.org', from.uri.domain in 'a.org b.org c.org', (to.uri.domain in 'a.org b.org c.org') && (user-agent == 'Linphone v2') | BooleanExpr | |
| contact-verified-param | Internal URI parameter added to response contact by first proxy and cleaned by last one. | verified | String |
| fix-record-routes | Fix record-routes, to workaround proxies behind firewalls but not aware of it. | false | Boolean |
| fix-record-routes-policy | Policy to recognize nat'd record-route and fix them. There are two modes: 'safe' and 'always' | safe | String |