> ## Documentation Index
> Fetch the complete documentation index at: https://plivo.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Interconnection Guides

> Connect your IP PBX or softswitch to Zentrunk — guides for common platforms

Want to connect your existing IP PBX or softswitch to your Zentrunk SIP trunks? Find your current phone configuration in this table, then click on the linked guide to read a step-by-step tutorial on how to configure Zentrunk to work with your existing infrastructure so you can start making and receiving calls.

| Vendor     | Type          | Supported | Guide                                                                                                                                  |
| ---------- | ------------- | --------- | -------------------------------------------------------------------------------------------------------------------------------------- |
| FreeSwitch | Softswitch    | Yes       | [Zentrunk and Freeswitch](/sip-trunking/interconnection-guides/freeswitch/)                                                            |
| Asterisk   | IP PBX        | Yes       | [Zentrunk and Asterisk](/sip-trunking/interconnection-guides/asterisk/)                                                                |
| FreePBX    | IP PBX        | Yes       | [Zentrunk and FreePBX](/sip-trunking/interconnection-guides/freepbx/)                                                                  |
| 3CX        | IP PBX        | Yes       | [Zentrunk and 3CX](/sip-trunking/interconnection-guides/3cx/)                                                                          |
| FusionPBX  | IP PBX        | Yes       | [Zentrunk and Fusion PBX](/sip-trunking/interconnection-guides/fusionpbx/)                                                             |
| Twilio     | VoIP provider | Yes       | [Twilio BYOC](/sip-trunking/interconnection-guides/twilio-byoc/)<br />[Twilio BYON](/sip-trunking/interconnection-guides/twilio-byoc/) |