Fully Stacked. 

SIPSTACK comes fully stacked out of the box. As needs and technologies evolve, so does SIPSTACK. 

Become a Partner

Over 50+ premium features available

With our Open Source platform, you can go beyond the essentials and create your own.

Phone Numbers

Bring your own provider or transfer your existing phone numbers plus choose from more than 200 available area codes and from over 60+ international countries.


Auto attendant / IVR

Auto attendant greets & identifies callers with a flexible phone menu that connects them to employees with self-service access. 


Dial-by-name directory

Dial-by-Name Directory gives your business phone system the feel and functionality of a system run by a Fortune 500 company.

Text messaging (SMS/MMS)

Send and receive unlimited text messages with your phone, email or via API or even integrate intelligent chat bots or more.

Hunt Groups

Quickly add users into hunt groups to easily direct incoming callers and phone numbers to multiple team members at the same time.

Call Centre / Queues

Configure single or multiple queues & route callers to the right agent every time according to your own business preferences.

Music on Hold

Keep callers entertained and informed with music and messages while they're on hold. Add company-wide or user specific music.


Use personalized greetings to establish your brand and enhance your company's image. Record by phone or upload your greetings.

Schedules & Time Groups

Route incoming calls based on your business schedule, holidays or by setting time range groups to direct callers based on your preference.

Feature Codes

Use the default feature code scheme or create your own to best fit and tailor your phone experience into your organization.

Conference Bridges

Boost team productivity with virtual meeting rooms for voice or video. Every user has their own private bridge to avoid scheduling conflicts.

Advanced Reporting

Additional call data automatically augments your experience with the most intuitive reporting metrics to best keep you informed

Additional features included on each user extension

Voicemail to email

Caller ID with name

Call waiting

Call forwading

3-way calling

Call blocking

Find me/follow me

Call recording

Music on hold

Caller ID blocking

Caller screening

Call transfer

Do not disturb

Video calling

User console access

Call detail records

Contact lists

Corporate directory

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Additional notificiations