SIP Peering

SIP Peering or SIP Trunking enables you to statically connect IP-PBX’s with our public sip proxy (

Note: Peering differs from Registration which relies on an authenticated UserName, Password to connect to our voice proxy.

Once you have enabled SIP Peering we whitelist your WAN IP blocking any other IP from communicating with our Voice service but an additional security measure from your side we advise setting a firewall rule restricting access to your SIP port to our public IP * See also Ports Ports IPs.

We support three modes of Peering:

  1. SIP Peering Global
  2. SIP Peering Standalone
  3. Trunking

SIP Peer Global

Routes all Inbound and Outbound traffic on an account to a single nominated WAN IP linked to one phone number. With the exception of Call Forwarding for emergency failover global Peering disables all functionality other CloudPBX functionality.

  1. Log into your account.
  2. Select Switchboard.
  3. Select the phone number to set SIP Peering against.
  4. Select Preferences.
  5. Select SIP Peering Global.
  6. Add Primary Trunk Host IP Address, and failover Trunk IP Address (optional)
  7. Select SAVE

Standalone Peer

A Standalone peer is where the network admin connects a IP-PBX to a single number. Standalone peering is convenient mechanism enabling administrators to connect multiple offices each with their own WAN IP.

  1. Log into your account.
  2. Select Switchboard
  3. Select Preferences
  4. Select Line SIP Peering Standalone >> Enable
  5. Add IP Address.
  6. Select SAVE

Once Standalone is enabled SIP Peering Global will be disabled.


Trunking is a Registration feature that allows you to present the CLI of another number on your account, using a trunking number removing the onerous task of individually registering large blocks of numbers to preserve CLI.

The Outbound trunking example below will present 13106341894 as the outbound CLI while using 13106341800 as the registered trunk number:

From: "13106341894" <sip:13106341800@>;tag=1c1952424
To: <sip:4243101076@>
  1. Log into your account.
  2. Select Switchboard.
  3. Select your number.
  4. Select Preferences | Trunking.
  5. Set Inbound trunking number
  6. Select Outbound Trunking
  7. Select Save.

Other Notes

  • CallerID: Asterisk-based PBX systems the name part can be set in the SIP configuration with the caller id= field – or if you wish to present it in the dial plan when you use the CALLER ID (name) variable. By changing this name partly to the number you wish to present on the call you can achieve multiple caller ID presentations for each DDI over a single registration or login.
  • P-Asserted-Identity: see also a P-Asserted-Identity header (RFC 3325) to define the Caller ID as an alternative to manipulating the name field (subject to your system support for RFC 3325).
  • Groups: Ensure that all FROM numbers are within the same ‘Group’ as the Outbound trunk number.
Updated on 19 October 2021

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