pbxnsip Toplink

The pbxnsip PBX can be used to make and receive calls from Toplink accounts. This page describes how a trunk should be configured in order to minimize the time to set up a Toplink trunk.
Toplink seems to use some kind of session border controller, in the version that we used for documenting the setup, they are sending four zero packets back to the user agents if they determine that this user agent seems to be behind NAT. This mechanism works in most environments, however some routers do not accept outside traffic for refreshing NAT bindings.

Sample

Toplink customers must register their accounts at toplink, therefore the register trunking mode must be used. A sample setup looks like this:
Name: Toplink
Type: SIP Registration
Display Name: Test Customer
Account: D1052222000
Registrar: toplink-voice.de
Username: D1052222000
Password: XXXXXXXX
Password (repeat): XXXXXXXX
Outbound Proxy: toplink-voice.de
Explicit Remote-Party-ID:
STUN Server:
Keepalive Time:
Extension: !+4930314([0-9]*)!\1!u!0
Prefix: +4930314
Is Secure: yes
Strict RTP Routing: off
Ringback: Media
Failover Behavior: No failover

Extension Parameter

The Extension can be set to a simple account (e.g. auto attendant), but because in Europe direct inward dialling is easy, the PBX will probably extract the extension number right out of the SIP packet. In order to do this, the extension should be a pattern like shown in the example, where the PBX will match the international number prefix provided by toplink and use only the extra digits to locate the account. The default account will be 0, in case that the number should not be available on this system.

Prefix

The prefix parameter is used to convert the PBX number into a global telephone number and is used for outgoing calls.

Security

Toplink does not support secure calls. If you want to initiate secure calls, you need to check if the route between the PBX can be attacked by eavesdroppers. If you have doubts, you better turn the flags to off.