Configuring VoIP Providers Or SIP Trunks – 3CX

VoIP Providers or SIP Trunks delivers telephone services and unified communications to customers who uses and are equipped with SIP Based PBX like 3CX.

Unified communications applications provides services like; voice calls, video conferencing, and web conferencing.

Requirements:

• Supported VoIP provider (SIP Trunk)
• Firewall tested and passed
• Supported VoIP Provider
  • Easy Setup
  • Tested and passed by 3CX
  • Supported by 3CX Support
• Generic VoIP Provider
  • Not tested by 3CX
  • No available 3CX Support

• Provides Public Switched Telephone Numbers (PSTN)
• Transmit via existing Internet Connection

Adding a Provider:

• From Management Console, go to SIP Trunks
• Click on Add SIP Trunk button
• Choose Country and Supported Provider
• Then set the Main Trunk Number

Note: This will act as “Catch All” for all non created DIDs for the trunk.

DID Inbound Rules:

• Will route incoming calls to a destination that is based on the Dialed Number
  • Extensions
  • Voice Mail of Extension or Group
  • Forwarding to outside number
  • Fax Service
• Different destinations will be based on
  • Time of the day
  • Holiday

Note: This will only add DIDs which do not follow the “Catch All” destination.

Adding DIDs:

• From Management Console, go to SIP Trunks, Your Trunk, then click DIDs Tab and click on Add DID Button
• Enter * + Last 6 DID Numbers
  • Sample DID No.: 001 333 1234567
  • Added DID No.: *234567
  • To save new DID, just click on “OK”

Adding Inbound DID Rules:

• From Management Console, go to Inbound Rules and then click Add DID Rule
• Set the name for DID
• Pick DID from the Drop Down Menu
• Then Point to Destination

Outbound Rules:

• This is to allow and restrict called numbers
• To select SIP Trunks basing on the criteria (as indicated below)
  • Destination number
  • Originating internal extension
  • Originating extension based on the Group Membership
  • Length of the dialed number

Adding Outbound Rules:

• From Management Console, go to Outbound Rules and click Add
  • Set the Name and Criteria
  • Should start with Prefix: “0-9 and +”
• Setting Outbound routes
  • There are 5 routes for the calls, the 2nd to 5th will be a backup and digits removed or added from each route.

Outbound Caller ID function:

• You need to ask your provider for the Right Outbound Caller ID Format to use
  • Common EU formats: (this is to be used without spaces)
    • +44 555 1234567
    • 0044 555 1234567
    • 49 555 1234567
    • 0 555 1234567
    • 555 1234567
    • 1234567
  • Common US formats: (this is to be used without spaces)
    • +1 555 1234567
    • 1 555 1234567
    • 555 1234567
    • 1234567

Here are some common set-up errors that you may encounter and which needs to be checked to resolve the problem.

• Outbound calls keeps dropping after 32 seconds
  • Active SIP ALG – needs to disabled from the firewall
  • Wrong Public IP address – needs to have the public IP address checked and replaced
  • Firewall Check NOT Passed – needs to perform Firewall Check and have all points to be GREEN (Passed)

• One Way Audio Issue
  • Firewall Check NOT Passed – needs to perform Firewall Check and have all points to be GREEN (Passed)
  • Wrong Public IP address – needs to have the public IP address checked and replaced