Adore SIP Client

Adore SIP Client is designed specifically to leverage the iPhone's unique capabilities and easy way to make a iPhone voip call by using iPhone devices. Featuring a comfortable and simple user interface iPhone sip client lets you connect your iphone to standard landline or mobile phones.
The iPhone sip client is meant for service providers who can use this dialer and get it integrated with their existing SIP servers. Adore SIP Client works just like standard SIP Softphones i.e. it gets registered on the SIP server and then let the authentic caller makes calls.
This softphone also turns your iPhone into a VoIP phone, so you can make cheap or even free phone calls over the internet at anytime, and from almost anywhere.
Features
Customized with company logo/name
Unlimited user license
SIP protocol support
Making and receiving calls
Background support - receive calls while the app is in the background, switch between apps and stay on the call.
Codecs supported: G729, G722, G711,GSM
Call timer
Recent Call
Phone Book (Synchronize with Phone Address Book)
Add contact from App
Local signaling (Dial tone, busy, ring back, etc.)
Redial
Speaker
Mute
Touch Tone
Silence Suppression
Echo Cancellation
Registration Timeout
Proxy Setting
STUN Server
System Requirements:
Supported : iOS 7.0 or later.This Application is optimized for iPhone 5 and iPhone 6s .
Internet Connectivity: Wi-Fi,3G.