The following configuration is based on the example found `here <http://support.simonics.com/support/solutions/articles/3000033840-asterisk-sip-conf>`_
* username: ``GV18005551212``
* password: ``password``
* exten: ``18005551212``
* host: ``gvgw.simonics.com``
General SIP configuration
=========================
Under :menuselection:`Services --> IPBX --> General settings --> SIP Protocol`.
* General
* Match users with 'username' field: *checked*
.. figure:: images/simonics_sip_general.png
:scale: 85%
Trunk settings
==============
Under :menuselection:`Services --> IPBX --> Trunk management --> SIP Protocol`.