# Configuring SIP Trunks **SIP trunking** is used for call setup, management, and teardown. It is flexible, reliable, and lightweight, allowing you to focus on your business rather than underlying telephony complexities. SIP is the foundation of **Voice over IP (VoIP)** communications, and **SIP Trunking** enables VoIP connectivity through a PBX by connecting your system to external carriers and service providers. *** ### Supported SIP Trunk Providers PortSIP PBX supports a wide range of **mainstream SIP trunk providers worldwide**, including but not limited to: * [Vonage](https://www.vonage.com/) * [QuestBlue](https://questblue.com/) * [VoIP.ms](https://voip.ms/) * [Voxtelesys](https://voxtelesys.com/) * [Bandwidth](https://www.bandwidth.com/) * [Flowroute](https://flowroute.com/) * [Skyetel](https://skyetel.com/) * [Wavix](https://wavix.com/) * [Twilio](https://www.twilio.com/en-us) * [Telnyx](https://telnyx.com/) * [Callcentric](https://www.callcentric.com/) * [Telstra](https://www.telstra.com.au/) * [Gamma](https://gammagroup.co/products/sip-trunking-call-management/) * [VoIP Innovations](https://carrierservices.sangoma.com/) * [Aire Networks](https://airenetworks.es/) * [CM.com](https://www.cm.com/) * [VoiceMeUp](https://www.voicemeup.com/) * [SIPTRUNK](https://www.sipturnk.com) * [SMSGlobal](https://www.smsglobal.com/) *** ### SMS-Enabled SIP Trunk Providers The PortSIP PBX has integrated the SMS feature as well with the following trunk providers: * [Configuring Quest Blue SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/questblue-sip-trunk.md) * [Configuring Twilio SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/twilio-sip-trunk.md) * [Configuring Bandwidth SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/bandwidth-sip-trunk.md) * [Configuring Flowroute SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/flowroute-sip-trunk.md) * [Configuring Telnyx SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/telnyx-sip-trunk.md) * [Configuring Vonage SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/vonage-sip-trunk.md) * [Configuring VoIP.ms SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/voip.ms-sip-trunk.md) * [Configuring Voxtelesys SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/voxtelesys-sip-trunk.md) * [Configuring Wavix SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/wavix-sip-trunk.md) * [Configuring VoIP Innovation SIP Trunk](/portsip-communications-solution/configuring-sip-trunks/voip-innovations-sip-trunk.md) * [Configuring Aire Networks Trunk](/portsip-communications-solution/configuring-sip-trunks/aire-networks-sip-trunk.md) * [Configuring CM.com Trunk](/portsip-communications-solution/configuring-sip-trunks/cm.com-sip-trunk.md) * [Configuring VoiceMeUp Trunk](/portsip-communications-solution/configuring-sip-trunks/voicemeup-sip-trunk.md) * [Configuring SIPTRUNK Trunk](/portsip-communications-solution/configuring-sip-trunks/siptrunk-sip-trunk.md) * [Configuring SMSGlobal Trunk](/portsip-communications-solution/configuring-sip-trunks/smsglobal-trunk.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.