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Normally this is done using one SIP trunk. This trunk has specified how many speak channels you can use at the same time and a series of public telephone numbers you have.
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Normally this is done using one SIP trunk. This trunk has specified how many speak channels you can use at the same time and a series of public telephone numbers you have.

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Sorry, let me clarify. My company has 42 employees, each with a separate line and extension. Can all those go over one trunk?
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Sorry, let me clarify. My company has 42 employees, each with a separate line and extension. Can all those go over one trunk?

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provided options, no response.
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Can I have all my phones and extensions traverse across one SIP trunk? Or do I need multiple trunks?
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Can I have all my phones and extensions traverse across one SIP trunk? Or do I need multiple trunks?

SIP trunking

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

Voice Over IP

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.