Update provision_manual_grandstream.rst

source/applications/provision/provision_manual_grandstream.rst

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 GrandStream
 ============
 
+.. image:: ../_static/images/fusionpbx_grandstream4.jpg
+        :scale: 85%
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+Registering an **Extension** using a hardware phone or adapter (ata) using Grandstream. 
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+Granstream is one of the common brand of phone and adapters for voip.  From call centers to offices and home offices Grandstream products can be found.  Grandstream has a large selection of hardware from phones, video phones to analog telephone adapters.
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+In our example we will register an analog telephone adapter (ata) model HT701.
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+1. Goto the device ip address. The default password should be admin. Enter admin and click login
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+.. image:: ../_static/images/fusionpbx_grandstream.jpg
+        :scale: 85%
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+2. Click on the **FXS PORT** tab on the top right.
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+| ``Primary Sip Server: subdomain.domain.com``
+| ``Failover SIP Server: subdomain1.domain.com (this can be left blank or can use Primary if only 1 sip server)``
+| ``SIP User ID: 1000``
+| ``Authenticated Password: thepassword``
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+Click **Update** then click **Apply** at the bottom
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+.. image:: ../_static/images/fusionpbx_grandstream2.jpg
+        :scale: 85%
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+3. Click the **Status** tab on the top left.  You should see the *Registration* as **Registered** and the *User ID* **1000**
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+.. image:: ../_static/images/fusionpbx_grandstream1.jpg
+        :scale: 85%
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+- Troubleshooting tips
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+* Check, double check that the correct extension number and password is being used.
+* Reboot the device.
+* Check Fail2ban and see if the ip got blocked.
+* Make sure you have created an DNS A record for the domain being used and there are no typos
+* Nat, firewalls and router settings.  Some brands of routers can cause issues.  Google the make and model of router or firewall appliance for common settings or remedies.
+* Visit Grandstream Supoprt http://www.grandstream.com/support
+|