Setting up SIP Internet Telephony on Android (built-in Android Soft-phone)

Android has a built-in softphone that can be used instead of third-party applications like 3CX Phone and others. The built-in softphone is very simple and convenient to use. It supports multiple accounts (SIP accounts), works well with many SIP operators. It can be configured only for outgoing calls or register with a SIP server and receive incoming calls. Continue reading “Setting up SIP Internet Telephony on Android (built-in Android Soft-phone)” >

Ways to Connect via SIP: Trunk, SIP Accounts. What is The Difference?

Today, the switching of telephony to VOIP (Voice over IP) is in full swing. As a basic protocol, SIP (Session Initial Protocol) is the one most often used. The versatility of the protocol can cause confusion – it can be connected to both ordinary subscriber terminals (SIP phones, SIP adapters, soft phones, etc.), and VoIP nodes (from IP PBX to Softswitch and Gateways with E1 etc.). The following are important connection characteristics for SIP. Continue reading “Ways to Connect via SIP: Trunk, SIP Accounts. What is The Difference?” >

SIP Registration, Brunch, Softphone and Other Scary Words of Cloud Exchange Systems

Internet technology is a very big thing. Sometimes it happens that one develop different software, for different OS, using different programming languages for fifteen years and it seems to him that he knows a lot. Then a step to the side – and there Narnia  – SIP, RTP, SDP and PBX. The last few months, we are pretty busy with voice telephony, and several times I caught myself thinking that the documented area for beginners is not that very good. Well, if for some reason ten articles “IP telephony from scratch” is not written yet, then this is a good opportunity to write a post for a wide range of readers. Long posts I do not really like, so I’ll tell you a small, but the interesting part of the theory: how the cloud telephony systems interact with each other and with telecommunication companies. Continue reading “SIP Registration, Brunch, Softphone and Other Scary Words of Cloud Exchange Systems” >