Prerequisites

• Grandstream version 1.5A or newer is installed and running with appropriate permissions and behind a secure firewall
• Familiarity with configuring Grandstream and administrative access
• A valid OnSIP Hosted PBX account
• An OnSIP Trunking enabled user

Step 1: Gather information for the OnSIP Trunking User

You will need the following information from the OnSIP Trunking User in the Admin portal:

• Username
• Auth Username
• SIP Password
• Domain
• Outbound Proxy

You can find this information in the user detail pages under the Users tab in the Phone Configuration section.

Step 2: Add the OnSIP Trunking user as a SIP Trunk in Grandstream UCM6104

Log in to the Grandstream Admin page

• Create New SIP Trunk
• Under the Basic Settings section
• Complete the following:
  
  Provider Name > OnSIP
  Host Name > Domain
  Transport > All-UDP Primary
  Keep Trunk CID > checkmark (see image below)
  TEL URI > Disabled
  Need Registration > checkmark (see image below)
  Username > Username
  Password > SIP Password
  AuthID > Auth Username
  SAVE
  
  
• 

• Under Advanced Settings section
  Codec Preference > Selected Codecs = PCMU, PCMA, G.722, GSM, G.729
  From Domain > Domain
  From User > Username
  Outbound Proxy Support > checkmark (see image below)
  Outbound Proxy > sip.onsip.com
  DID Mode > Request-line
  DTMF Mode > Default
  
  

Step 3: Make test calls

Verify connectivity and correct signaling by placing test calls against a land line or cell phone.