VoIP:Hardware:3CX

Introduction

VTX SIP Trunk ( Connect_PABX service ) is compatible with 3CX PBX System. VTX provided template since 2015 and was officially certified since 2018. In 2022 VTX got removed from the Operator in 3CX templates. Since then we are trying to pass new certification without success. There is no ETA for 3CX Certification, but trunk can be used with "SIP Generic Trunk" or by importing VTX template manually using Create a VTX SIP Trunk with XML template

Documentation

• Official Web Site: http://www.3cx.com/
• Documentation: https://www.3cx.com/docs/manual/

Configuration

SIP Trunks

General Tab

• Trunk Details
  • Name = "VTX Service SA"
  • Registrar/Server/Gateway Hostname or IP = s1.XX.trk.ipvoip.ch ( Uniquer per customer, copy paste info from VTX Kiosk ex : s1.238234.trk.ipvoip.ch)
  • Outbound Proxy : 212.147.47.218 ( DNS resolution of the SIP Registrar/Server/Gateway Hostname )
  • Number of SIM Calls : 4 or more ( Depends on the Service Type you have ( Connect_PABX_4 => 4 calls, Connect_PABX_8 => 8 calls, Connnect_PABX_60 => 60 calls, ...) )
• Authentication
  • Type of Authentication : Register/Account Based
  • Authentication ID (aka SIP User ID) : 41...lbo ( Uniquer per SIP trunk, copy paste info from VTX Kiosk)
  • Authentication Password: ( Uniquer per SIP trunk, copy paste info from VTX Kiosk)
• Route calls to
  • Main Trunk No: 004121566... ( Warning, by default incoming call routing number are in international format 0041, this can be changed on request to +e164 or National format )

DIDs

0041215668340
0041215668341
0041215668342
0041215668343

Options

• Advanced
  • PBX Delivers Audio = Yes ( forces the PBX to convert RTP stream, will use resources on the PBX and might trigger problem )
  • Supports Re-Invite = Yes
  • Force Invites to be send to IP of Registrar = Yes
  • Re-Register Timeout = 600
  • Select which IP to use in 'Contact' (SIP) and 'Connection'(SDP) fields = Local IP Address
  • Transport Protocol = TCP (Not to have problem with Firewall that do not accept UDP fragmented packets)
• Codec Priority
  • G722
  • G711a
  • G729
• Options
  • Set Contact (SIP) and "Connection" (SDP) with "Local IP"

Inbound Parameters

Keep it default or adapt it to fit your needs

Outbound Parameters

Here are the parameters that you need to adapt to be able to bill all numbers

SIP Field	Variable	Impact	Explanation
P-Preferred Identity : User Part	Leave default value (old value : "LineNumber")	Will not send P-Preferred-Identify Header anymore not to always bill your LineNumber all the time	PPI needs only to be used to define the number to be billed So it is only useful when you wish to display a number out of your range with "Special Arrangement" and bill one specific number of your trunk
P-Preferred Identity : Host Part	Leave default value (old value : "GWHostPort")

Extensions

General Tab

• User Information
  • Outbound Caller ID : 0041__ ( Enter here the number to display for outgoing call for this extension from the trunk or external if you have "Special Arrangement / CLIP No Screening" )

Inbound Rules

Create a new incoming DID rule with a number added in the SIP trunks DDI

• Name = "Useful Description"
• DDI = Select one from the list
• Route calls to = Set it up according to your needs

Outbound Rules

Add the following rules

• General
  • Rule Name = VTX_Default_Rule
  • Calls to numbers starting with prefix = 0
• Make outbound calls on
  • Route: "VTX Services SA" + Strip Digits = 0

Usage

Create a VTX SIP Trunk with XML template

• Information: If "Special Arrangement / CLIP No Screening" (advanced feature) got activated on your VTX trunk, you can manually adapt the parameters as described in Outbound Parameters or import the Advanced VTX Template below
• Problem: The "VTX" SIP trunk template has been temporarily deleted from the 3CX SIP trunk template list. We are checking to have it added back, but no ETA for 3CX Certification
• Workaround: You can import the VTX Template manually following procedure below

1. Download the 3CX VTX Template on your PC
   1. ("default" template v18) : https://wiki.vtx.ch/media/3CX_VTX_provider.pv.xml
   2. ("default" template v20) : https://wiki.vtx.ch/media/VTXv20.pv.xml
   3. ("Special Arrangement template" v18) : https://wiki.vtx.ch/media/3CX_VTX_provider_advanced.pv.xml
   4. ("Special Arrangement template" v20) : https://wiki.vtx.ch/media/VTXv20adv.pv.xml
2. Connect on your 3CX PBX Admin interface
3. V18: Go in "SIP Trunks" menu and click on the "Import Provider" button
4. Upload the "3CX_VTX_provider.pv.xml" file (or 3CX_VTX_provider_advanced.pv.xml)
5. V20: Open "Advanced" menu, click on "Templates" then choose "Provider Templates" and click on "Import Provider" button
6. Import the "VTXv20.pv.xml" file (or VTXv20adv.pv.xml)
7. Finish the setup of your trunk using the VoIP:Hardware:3CX#Configuration