> For the complete documentation index, see [llms.txt](https://kb.hostednetwork.com.au/support/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kb.hostednetwork.com.au/support/services/voice-over-ip-voip/technical-references/sip-trunk-requirements-ports-protocols-and-codecs.md). # SIP Trunk Requirements: Ports, Protocols, and Codecs #### Network Ports: * **SIP Signaling (Port 5060):** This port is crucial for establishing, managing, and terminating SIP calls. All SIP communication between your PBX and the Hosted Network SIP trunk uses UDP (User Datagram Protocol) on port 5060. * **RTP Media (Ports 10000-20000):** Real-time Transport Protocol (RTP) carries the actual voice data during a call. SIP trunking typically utilizes a range of UDP ports between 10000 and 20000 for sending and receiving RTP media streams. #### Network Protocols: * **UDP (User Datagram Protocol):** SIP trunking relies on UDP for both SIP signaling (port 5060) and RTP media streams (ports 10000-20000) #### Supported Codecs: Codecs (coder/decoder) compress and decompress voice data for efficient transmission over the internet. Our SIP trunk supports various codecs, * **G.711** * **G.729** --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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://kb.hostednetwork.com.au/support/services/voice-over-ip-voip/technical-references/sip-trunk-requirements-ports-protocols-and-codecs.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.