What is SENDR?


SENDR is a web interface made for campaign management. It lets you set up voice and SMS campaigns in with a streamlined UI, straight from your browser.

SENDR builds the reports of your campaigns on top of your existing address books, making it a very handy tool to qualify databases. Moreover, because of the numerous campaigns options it offers, SENDR is very effective at raising awareness, be it for a cause (Politics/NGO) or a sale-event.

Finally, because SENDR offers numerous callbacks options and lets its users mix voice and SMS in their workflows, it's also a very potent tool for debt collection.

Campaign Types

SENDR supports four different types of campaign:

  1. Voice Broadcasting: call campaign to broadcast a media of your choice to your prospects.
  2. Interactive Voice Response: call campaign using IVR menus to let your prospects interact.
  3. Direct-to-Voicemail: call campaign to broadcast a media straight to the voicemail of your prospects without ringing their phones.
  4. SMS: broadcast text messages to your prospects, and let them answer back.

Each campaign type is documented with a full step-by-step tutorial.


Medias are audio files that can be used any time an audio file is played (media broadcasting, ringing tone, waiting tone, bridge, call whispering...). You can upload audio files directly to the interface, to be used as media. You can also use Text-to-Speech (TTS) to generate an audio file from a written prompt. Finally, medias can be created directly from your or your clients' phone.

Learn more about medias with our dedicated resource.

Address books and Blacklists

Address books and Blacklist are lists of contacts. They are .csv files containing one contact per line while the first line is used for data headers.

Address books are lists of prospect you can reach with your SENDR campaigns. Reporting are built on top of your address book to help you refine your databases.

Blacklist are lists of numbers to ignore with your campaigns. You can upload blacklist straight from the interface (if you have done previous SMS/Voice campaigns) or let them populate dynamically with your campaigns. Indeed, if you handle unsubscription on a given campaign, the unsubscribed prospects will be added to the associated blacklist.

Learn more about address books and blacklists.

Campaign reports

Campaign reports are statistics presenting the results of your campaigns. They include the amount of number called, calls answered and failed as well as metrics about the listening of your campaign message and the actions (such as key pressed) undertook by your prospect.

Learn more about campaign reports.


Phone Numbers / DIDs

Phone numbers are used for voice and SMS campaigns in SENDR. You can send your campaign using any DID number your own, or as "BLOCKED" (masked number). Please keep in mind two essential matters:

  1. Campaigns using BLOCKED number are not able to process replies (since your prospect have no number available to reply to).
  2. Legal restrictions apply to the usage of BLOCKED numbers on marketing campaigns. In most countries, it is ILLEGAL to initiate a marketing campaign with a blocked phone number.

Learn more about numbers at CALLR.


Channels determine the maximum number of simultaneous calls your campaign/account is allowed to have. On large scale campaigns, channels are a determining factor for campaigns' duration.

Learn more about channel management.


CDRs are exhaustive metrics about your call campaigns. They include 20+ metrics on each phone call initiated using CALLR, including: price, CLI used, dial status, duration, hangup cause and source, duration, start and end time....

Learn more about CDR.


SMS Sender ID

SMS campaigns on SENDR can also use any (mobile) DID your own. Moreover, SMS supports another type of sender identification: SMS Sender ID. It allows you to display an alphanumeric string of characters instead of a number as the sender, such as "YOURBRAND".

SMS Sender IDs can be added to your account with no extra charge, as long as the requested ID is relevant to your business and avoid being too broad or misleading.

Learn more about SMS Sender ID. 

Character encoding

Character encoding allows for the representation and transmission of characters according to an encoding system. It's necessary for the accurate transmission of the incredibly diverse characters and symbols used to communicate by text messages all over the world.

Depending on the encoding, the character limit per SMS varies which in turns have repercussions on the message/campaign cost. SENDR is made to prioritize accurate transmission on your message at an efficient cost. If you use non-GSM characters, they will be replaced by a GSM equivalent if possible to lower your campaign cost.

Using UNICODE characters without GSM equivalent (such as Chinese symbols) will cause the encoding to switch to UNICODE, lowering the character limit per SMS.

Learn more about character encoding for SMS.

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