How many max possible concurrent calls on 1 line?
# general-englishm
Mat99
03/22/2025, 12:51 PMI understand that enabling more than 10 concurrent calls requires purchasing additional lines. However, I was wondering—if I have a single Twilio number and I'm paying for hundreds of concurrent lines, is there a limit to how many calls that number can handle at once?
Would the bottleneck come from Twilio itself, or is it solely dependent on VAPI and the number of concurrent lines I have available there?
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AiTitus :)
03/22/2025, 2:25 PMi am curious as well.
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Sahil
03/22/2025, 2:26 PMBoth actually.
Sahil
03/22/2025, 2:30 PMBut from Vapi side. You will get 10 concurrency line per org where all the things like inbound, outbound, web calls everything comes under it.
Sahil
03/22/2025, 2:30 PMIt doesn’t depends on number of phone numbers you have
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Mat99
03/22/2025, 6:32 PMI see thank you!
Mat99
03/22/2025, 6:35 PMSo i’ve researched and twilio allows 1 call per second and if i try to initiate more than 1 call per second it just queues the call
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~Stu~ CoreAspect.Agency
03/22/2025, 10:00 PMThis has probably been asked a thousand times but what does the 11th caller getting terms of message when concurrency is reached?
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Mat99
03/22/2025, 11:55 PMNot sure they probably won’t get the call ahahah and the api will return an error. Maybe no message?
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~Stu~ CoreAspect.Agency
03/23/2025, 11:32 PMim guessing the vapi api just refuses the Twilio (or other) webhook connection so you should (in theory) get a programable TWIML message back to the user if its inbound, if its outbound i guess it doesn't make the call and returns and error webhook message.
~Stu~ CoreAspect.Agency
03/26/2025, 5:57 AMi just attempted to test this by firing off 11 inbound calls and then a second later 11 more inbound calls (max duration 10 seconds in the config for each assistant) - total 22 ongoing - all call connected and were processed as normal... so i couldn't test my theory of a api fail so i could reroute using Twilio... which is a shame, but interesting in itself. @AiTitus :) @Sahil
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AiTitus :)
03/26/2025, 6:25 AMYes interesting I have hit limits at 10 simultaneous inbounds active
~Stu~ CoreAspect.Agency
03/26/2025, 6:26 AMrun, and run... all processed... all worked...
Funny story, whilst i was testing this i made a mistake and i made two of the same assistant call each other for ten mins
~Stu~ CoreAspect.Agency
03/26/2025, 6:37 AMdo you use Twilio? do you know what happend so the 11 tha call? id like to redirect them to a mesage bank.. but i cant replicate it
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