Update Gateway1.rst

source/Gateway-Inbound-Outbound/Gateway1.rst

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 Gateway setup
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 .. image:: https://cloud.githubusercontent.com/assets/13131198/11903431/270a6c1c-a587-11e5-8473-f7e84e02bf0c.png
   
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+Gateways provide access into other voice networks. These can be voice providers or other systems that require SIP registration.
   
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