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During my searching for the VOIP solution i found http://VOIPSIPSDK.com
which offering many Freature that include:
* Registrar support
* Dynamically loadable codecs
* SIP Proxy authentication
* Multi-party voice conference
* Play wav files into conversation
* Record conversation into file
* Hold/Retrieve call
* Forward Call (Blind Call Transfer)
* Transfer Call (Attended Transfer)
* Mute Sound
* Authorization Id
* Noise reduction
* Auto gain
And Many Other services they offer
many Available codecs:
* G.726 (16k 24k 32k 40k)
* Speex (Narrow, Wide)
Before I will Buy its Premier version I would like to get reviews from Peoples experience.
Here's Softphone screenShot
I have tried some SDKs, they have quite different licensing. Regarding features, I tend to choose Ozeki VoIP SIP SDK because its licensing is only differentiated based on the number of calls. So for making 30-50 calls, I can choose a license whereas the functions are the same in all licences. Is it correct?