Ozeki .Net SIP SDK for developing Windows Forms
softphone in VB.Net to implement VoIP calls. The sample
program allows to make/receive calls, handles DTMF
signals to navigate in IVR systems. It is customizable
with more features and company logo. It is compatible
with most of the PBX systems like Cisco UCM, Asterisk
PBX, 3CX Phone Systems and works with VoIP service
providers like Skype or Callcentric. It is based on
Ozeki SIP SDK that supports multiple simultaneous VoIP
phone calls and offers royalty free licensing. Ozeki
VoIP SIP SDK is the ultimate tool for software
developers to create a Windows Form Softphone in
VB.Net. It is based on C#.Net and that is why the
integration into any software developed in .Net is
really easy and makes the SDK a very versatile tool in
the hands of .Net developers. With the help of this SIP
SDK VoIP calls can be instantly implemented in any .Net
program. The sample program handles outgoing calls,
incoming calls, ends a call which is in progress,
displays the call status, handles audio data which
arrives from the remote end, forwards incoming audio
from the microphone to the remote end via the SDK,
receives DTMF signals, sends DTMF signals. It handles
one telephone line although Ozeki VoIP SIP SDK offers
the chance to develop and use multiple telephone line
handling simultaneously. Furthermore there are many
other functions that can also be implemented just like
chat function or call forwarding function. With Ozeki
SIP SDK excellent voice quality can be achieved so the
Windows Form Softphone in VB.Net sample program is
capable to deliver crystal clear sound. This is due to
the extended codec support (G.711 aLaw/uLaw, G.729,
iLBC, GSM, G.722, SPEEX, SPEEX-WB). After an Ozeki VoIP
SIP SDK license has been purchased it is free to use
Ozeki VoIP SIP SDK for .Net license with your product
and also your product can be freely distributed in as
many copies as you wish and there are no royalties or
license fees to pay to Ozeki Systems Ltd

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