Callgram has enhanced Telegram with free calls as other competitors of Telegram have done like Whatsapp. The free calls are fully integrated with the contacts identifiers and phone numers used by Telegram.
Callgram has own features:
- Free calls.
- SIP autoprovisioning.
- VoIP solution.
You can call to your Callgram counterparts, and leave a message if they are absent. They will be able to listen the voicemail messages.
But Callgram also inherits all the features that the app Telegram has:
- Send an unlimited amount of messages, photos, videos and files of any type (.doc, .zip, .pdf, etc.).
- Very fast
- Cloud storage.
- Group chat.
- 100% Free
The only difference is that we have included ads inside the app in order to maintain our VoIP servers that support the free calls. We are sorry about it, but it has been the most transparent way to provide this VoIP service for the end users.
This app is open source, and it is our commitment that Telegram can have the same functionality than other alternatives like Whatsapp, Viber, Tango and Skype.