Grandstream
Register a Grandstream GRP26xx series IP phone as a desk handset or on a desk phone line.
Click Show setup link on the phone's row in Settings → Phone → Voice & calling → Calling devices (a desk handset — a person's or a shared one like the reception phone), or on the number's card in Settings → Call routing (a desk phone line). See Desk phones for the difference.
Set up by link
On the phone's web page, open Maintenance → Upgrade and Provisioning.
Set Config Upgrade Via to HTTPS and type the setup link into
Config Server Path without https://. Leave the config server user
name and password blank.
Click Save and Apply, then Start Provision. The phone downloads its settings and registers; click Refresh on the card to see Handset registered.
If the phone refuses the link's security certificate, update its firmware — never switch certificate checking off, because the download carries the line's password.
Enter the settings by hand
Connect the phone to your network and power. Press the round menu button → Status → Network to read its IP address.
In a browser on the same network, open https://<phone-ip> and sign in
(factory login admin / admin, or the random password on the sticker
under newer units). Change it while you're there.
Go to Accounts → Account 1 → General Settings and fill in:
- Account Active: Yes
- Account Name: your practice name
- SIP Server: the server shown under Show setup link —
sip.telnyx.eufor a UK practice,sip.telnyx.comfor a US one - SIP User ID and Authenticate ID: the line's username
- Authenticate Password: the line's password
Under Accounts → Account 1 → SIP Settings, set SIP Transport to
TLS (port 5061), Register Expiration to 3 minutes, and turn
on the SIP OPTIONS keep-alive every 30 seconds.
Under Accounts → Account 1 → Audio Settings:
- Preferred Vocoder: G722 first, then PCMA and PCMU in the UK (PCMU before PCMA in the US), and no G729
- Send DTMF: via RTP (RFC2833) only
- SRTP Mode: Enabled and forced on a desk handset, Disabled on a desk phone line or a handset added before Smileline turned encryption on (see Desk phones)
Click Save and Apply. Status → Account Status shows the account as Registered.
Call the number from a mobile — the handset rings. If the line is two-way, dial out to confirm outbound.
Grandstream's manuals live at grandstream.com/support, and the carrier's guide is Grandstream GRP2612: SIP trunk configuration.