Rate this page:

Parallel and Serial SIP call (Beta)

This feature allows customers to dial multiple SIP endpoints both sequentially and in parallel.

Parallel calling

Your user Alice has four different ways to contact her. You can call her cell phone, SIP soft phone, SIP desk phone and SIP mobile client. This feature allows you to call all the end points at the same time. The first call to pick up is connected to the current call and the rest are hang up. For each noun (Sip, Number, Client) you can specify what call progress events you want to receive webhooks for.

This is applicable only for outbound dialing.


        Serial calling

        In contact centers you have multiple agents to answer the call. If one of your agent is busy you would want the caller to be connected to another agent. This feature allows to call all the agents sequentially. The priority of the call is based on the order within the Dial verb. For the below example, if Alice rejects or did not answer then the call will go to Bob. Similarly if Bob rejects or did not answer then the call will go to Charlie.

        This is applicable only for outbound dialing.


              You can use up to ten nouns (Sip, Number, Client) within a Dial verb to call simultaneously or sequentially.

              Join Parallel and Serial SIP calling Beta

              If you want to be part of the Parallel and Serial SIP calling Beta, please fill out our Request Form with your information, and you will be contacted with more details.

              NOTE: As this is a beta feature, we do NOT recommend this feature to be running in production environments!!

              Rate this page:

              Need some help?

              We all do sometimes; code is hard. Get help now from our support team, or lean on the wisdom of the crowd browsing the Twilio tag on Stack Overflow.


                    Thank you for your feedback!

                    We are always striving to improve our documentation quality, and your feedback is valuable to us. How could this documentation serve you better?

                    Sending your feedback...
                    🎉 Thank you for your feedback!
                    Something went wrong. Please try again.

                    Thanks for your feedback!

                    Refer us and get $10 in 3 simple steps!

                    Step 1

                    Get link

                    Get a free personal referral link here

                    Step 2

                    Give $10

                    Your user signs up and upgrade using link

                    Step 3

                    Get $10

                    1,250 free SMSes
                    OR 1,000 free voice mins
                    OR 12,000 chats
                    OR more