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The official Twillio API documentation can be found here.

How many simultaneous calls are available over Twillio Elastic SIP Trunking with a single number?

Trialing elastic sip trunking from Twillio with one number attached. My PBX wants me to input number of simultaneous calls and I do not find references to that in Twillio docs

3CX pbx

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  1. 0

    Twilio developer evangelist here.

    Elastic SIP Trunking is built to allow for unlimited concurrent calls. I think your PBX likely wants this information because older suppliers of SIP trunks would sell you connection with that sort of limit and the PBX would need to handle the limits for you.

    My colleague Devin dropped a link into comments that shows the limits of Twilio’s Elastic SIP Trunking. The limit applicable to your question is:

    Unlimited concurrent calls

    If your PBX really won’t let you move on without a number then I recommend you estimate the maximum number of simultaneous calls that you will need and enter that. Or just any really big number. Twilio will handle it.

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  2. 0

    3CX PBX have licence basic of simultanious calls [4,8,16,31 etc.], so even if Twillio is unlimited You will be limited to 3cx licence

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