Castel SIP App is a SIP intercom softphone. The easy-to-use and intuitive application, allows you to make and receive audio and video calls from IP intercom stations (XELLIP, CAPIP) on your iPhone or iPad. It works with a Castel SIP server (locally or hosted by Castel) through Wi-Fi and 3G/4G.Main features:- Audio with the following codecs: G711 (ulaw,alaw), GSM, G722- Video with the following codecs: H264, VP8, mpeg4- Multi calls (swap among active calls, merge calls, transfer calls)- Audio conferencing- Address book integration- Call history (received, missed and dialed calls list)- Echo cancelation- Loudspeaker, mute and hold- Interoperability: can connect to any SIP video phone supporting codecs above- DTMF (telephone tones) support using in-band, SIP INFO and RFC2833Note: Please, check your cellular operators terms of agreement to make sure they allow SIP calls on their network before using Castel SIP App.

Castel SIP alternatives

Grandstream Wave

Grandstream Wave -Video IOS 7.0SIPGrandstream Wave6624BLFPBXUCM6100UCM6510 IP PBXGrandstream WAVEDNDLDAP , 720P. G.711/aG.722 (HD-audio)G.726-32GSMiLBCOpus Speex SIP IOS 7.0 SIPTLS128/256SRTP 6SIP66 6 24BLF UCMLDAP NATNATSTUNUPnP xml 3.5mm IOS DND, DTMFIn audio, RFC2833, SIP INFOFail-over 2G3GWi-Fi 4G

iSip -VOIP Sip Phone

iSip, formerly sipphone. This is the first general sip client for iPhone. When the per-account prefix is not set, the prefix in setting will be used, it works for all callsDont hesitate to contact our support if you have any questions about this app.

Media5-fone SIP VoIP Softphone

IMPORTANT:Media5 Corporation announces the End-of-life (EOL) of the Media5-fone SoftClient on all platforms, including Media5-fone Free, Media5-fone Pro, and Media5-fone MPS, starting on August 31, 2018. Until then, support will be limited to fixing selected bugs and no new improvements or support on Operating System (OS) versions will be done. Please ask your mobile network operator before enabling the VoIP over 3G feature.

Linphone

Linphone is an open source app offering free audio/video calls and text messaging. With Linphone, you can be reachable at any time, even if the app is closed, with a WiFi or 3G/4G internet connection. Contact Belledonne Communications www.belledonne-communications.com for any specific development query.

JusTex

JusVoIPsipIP-PBX,IMS:- JusTex,SIPSIP:- - IP- : AMR-WB, G729, AMR, iLBC, PCMU, PCMA, G722, iSAC, opus- ,,DTMF,,,- ,VAD()QoS:- VP8, H264, H264-SVC- Wi-Fi, 3G, 4GLTE