Lately I've got to try a SIP videophone unique: it is produced by the SVP 5000 SBNTech.
The key features of this product are:
- Videophone Calls over the Internet
- Touch Screen LCD (10.2 inches / 800 × 480)
- Compliance industry standards IETF, ITU-T
- Video calls @ 30 FPS
- Digital Photo Frame as a Screen Saver
- Web Browser
- SD Card Slot & USB 2.0
- WiFi (802.11b / g / n)
- Bluetooth (option)
- A FXS port
- Integration HSDPA
- Video / Audio Input / Output
- Room / LCD Power Save Mode
- Support for audio codecs g711 / G729a
- Support for video codecs h263 and h264 (QCIF / CIF / QVGA / VGA)
Tests were conducted using both Asterisk 1.4.x on CentOS that Asterisk 1.6.x on Ubuntu Server in both cases installed from source. The configuration used for the tests was as follows:
videosupport=yes; abilita il supporto video in asterisk
In principle suggest you avoid, as far as possible a configuration where Asterisk should worry about retransmit the audio / video streams at the two end-points. This is why, in the suggested configuration, the parameter "canreinvite" is set to "yes".
The parameter "canreinvite = yes" makes it possible to Asterisk, once the call has been answered, to send a new INVITE message to the two endpoints with the necessary information to the establishment of a audio / video communication directly between them.
Beware that this "reinvite" will not happen, despite "canreinvite = yes" if:
1) one of the two clients is configured with "canreinvite = no";
2) if the clients use different codecs.
3) If the command Dial () contains parameters for recording sound (wo W) / call transfer (to T) / forced hangup (I H).
In all cases, the bandwidth required for a video call and of at least 200Kbps, provided that the canreinvite is active. In other cases need more bandwidth. Attention to the fact that as soon as an active video call, the phones use a value of bandwidth as low as possible. To get higher quality video must manually increment the parameter bandwidth dall'apposito configuration panel in call.
In my tests I used: H264 / G729 / VGA. It 's always possible to scale the parameter VGA to QVGA or QCIF if you want to further decrease (although not by much) the required bandwidth.
The tests carried out also seems that only when the work canreinvite a call between the video phone and a desk phone is not active in the first video. In other cases, it should be chosen by hand not to activate the video when you make or accept a call from the video phone.
Very intuitive and simple user interface: All functions are easily accessible thanks to the convenient touch display.
The product was kindly provided by www.4geek.it
Manufacturer's page: SBNTech
Tags: Call Center Systems | Voip Pbx | Asterisk Advisor Naples | Switchboard Phone | Voip | Asterisk CTI | PBX | IP Phones | Networking | Linux
Development of IVR systems, call center, PBX VoIP.