Grandstream IP Desk Phones

Logging into the web interface on a browser

Press the center button then go to Status, then Network Status to see the IP Address of the phone
Enter the IP Address into a browser on a computer on the same network as the phone
Enter the following credentials

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Username: admin
Password: admin
Please note: Newer Grandstream models have more secure passwords. This can be found on a sticker attached to the bottom of the handset.

Registering a VoIP User

Click on Account and then select the account you're registering - for example, 'Account 1'.

You'll need to fill out the following VoIP User details which can all be found in myTTNC

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Account Name: Display Name
SIP Server: Domain
SIP User ID: Username
SIP Authentication ID: Username
SIP Authentication Password: Password
Under SIP Settings → Basic Settings
Register Expiration: 1
Subscribe Expiration: 1

Preventing "Ghost" Calls

Occasionally, if a phone isn't behind a firewall, potential hackers will try to access public phone systems by scanning IP addresses for a response. These scans cause IP Desk Phones to ring and calls would show a string of digits such as 100, 1000, 10000. These are referred to as "Ghost Calls".

To prevent these calls we recommend using a firewall, however, you're able to prevent these directly on the phone by setting the following.

These settings may vary depending on the model of your phone.

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Under Advanced Settings → Call Features set the following:
"Disable Direct IP Calls" to 'Yes'
Under Accounts → Account x → SIP Settings → Security Settings and set the following:
"Check SIP User ID for incoming INVITE" to 'Yes'
"Accept Incoming SIP from Proxy Only" to 'Yes'

Enable 'Call Grab' (Feature code **ext)

Call Grab is a feature which allows you to pick up an inbound call on a ringing extension. To use this feature, you have to dial then the ringing extension number e.g 1000.

To enable this feature, you just need to set the following.

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Under Accounts → Account x → Call Settings
"Dial Plan" to { x+ |x+ | **x+ | xx*x+ }

To save you having to type the full feature code, you're able to configure a BLF (Busy Lamp Field).

The 'Extension' is set to ** to enable 'Call Grab' - when the BLF is flashing for an inbound call, you're able to press the BLF key and it will automatically take the call.

Changing Codecs

Our preferred codec to be used is PCMA.

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Under Account → Account x → Audio Settings set the following:
Set all preferred Codecs to be 'PCMA'

Network Transport Protocol

UDP is our preferred Transport Protocol as it's usually faster, simpler, and more efficient than TCP, however, in some scenarios, TCP may be the better Transport to use. This can be changed by updating the following:

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Under Account → Account x → SIP Settings → Basic Settings
"SIP Transport" to 'UDP' or 'TCP'

Configuring Call Waiting

TTNC VoIP Users have 2 channels which can be used for inbound and outbound calls.

When you're on a call, you're able to see a second inbound call to the phone by enabling Call Waiting. Alternatively, if you don't want to be able to see that second call, you're able to disable this setting.

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Under Settings → Call Features
"Disable Call Waiting" to 'Yes' or 'No'

Configuring Call Transfers

You're able to transfer calls to other VoIP User extensions or telephone numbers.

There are a couple of different methods:
Attended Transfer - allows you to speak with the destination you're transferring to before connecting them.
Blind Transfer - transfers the call away instantly.

To enable Call Transfers, set the following.

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Under Settings → Call Features
'Attended Transfer Mode' to 'Dynamic'

Updating Firmware

Grandstream occasionally makes updates to the firmware for their phones.

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Under Maintenance → Upgrade and Provisioning
Select “Always Check for New Firmware”
Under “Firmware”, Select Upgrade via HTTP
Enter “firmware.grandstream.com” under Firmware Server Path

Configuration Backup

You're able to back up the phone's configuration by exporting the config.

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Under Maintenance → Upgrade and Provisioning:
Find the 'Config' heading, 'Download Device Configuration' will have a link to download a backup of your phone's configuration.