Phone Commander - free portable softphone

Phone Commander is a free portable softphone that you can use to make and receive VoIP phone calls from your PC, iPhone or Android based smartphone.

Phone Commander like a telephone to let you make calls through your computer. Call anyone via the internet who also has a softphone installed and if you sign up with a VoIP gateway service company you call regular telephone numbers as well.

The advantage of using Phone Commander is that you can leverage low cost or free VoIP calls and you can connect to the company SIP PBX and work remotely.

Easy to use and powerful Windows program was designed for people who want to improve dynamic interactions with contacts and to manage contact information. It supports multiple SIP accounts and save calls history.

See all contact information for incoming calls. For example, you can see Firstname, Lastname, Birhdate, Company name and other information before call answering. Keep detailed records and notes in your call log about each call and contact.

You can use Phone Commander as a customer database, or personal contact address/phone book, working with groups for managing contact info of individuals and organizations with relationships. Phone numbers, emails, web pages, faxes, pagers, addresses, customer notes - you can save all this data in an organized format.

You can dial phone numbers in one click via Internet. Program has a simple intuitive interface and quick and easy contact lookup. Import and export features are also available.

Attractive and easy-to-use organizer & PIM will keep track of your contacts, addresses, distribution lists, manage your schedule, remind about appointments, and keep your daily notes in order, store your contacts and call by one click. The slick user interface makes it a snap to find addresses and phone numbers, enter reminders.

With its intuitive & familiar interface, users can seamlessly transition from a traditional hard phone environment into the world of Voice over IP. Also by making the navigation simple and user friendly, Phone Commander provides users with easy access to address book management.

The program detects DTMF user input, sends DTMF (Inbound, SIP INFO, RFC2833), supports G.721 A-law/Mu-law, GSM.610, Speex. You can select audio In/Out Devices.

MGCP/Megaco Architecture
MGCP Megaco Architecture
> ABOUT SIP > SIP H323 AND MGCP > MGCP ARCHITECTUREMGCP Architecture

MGCP/Megaco Architecture

MGCP/Megaco exploded H.323's gatekeeper model and removed the signalling control from the gateway, putting it in a "media gateway controller" or "softswitch". This device would control multiple "media gateways". Effectively, this was a decomposition of the H.323 architecture into SS7 equivalents, creating signalling intelligence that could act as a peer to the SS7 entities.

In the MGCP/Megaco architecture, the intelligence (control) is unbundled from the media (data). It is a master-slave protocol where the master has absolute control and the slave simply executes commands. The master is the media gateway controller, or softswitch (or call agent) and the slave is the media gateway (this can be a VoIP gateway, a DSLAM, MPLS router, IP phone etc.). This is a contrast to the peer-to-peer nature of SIP and other Internet protocols where a client can establish a session with another client.

MGCP/Megaco instructs the media gateway to connect streams coming from outside a packet network on to a packet stream such as RTP. The softswitch issues commands to send and receive media from addresses, to generate tones, and to modify configuration. As can be seen from the diagram to the right, MGCP/Megaco is used for communication downward, to the media gateways. The architecture, however, requires a session initiation protocol for communication between gateway controllers.

In mirroring the SS7 architecture, MGCP/Megaco "soaks up" the complexity of the central offices. In this way, it can be used as a control protocol delivering services across the network via media gateways. By gathering intelligence (and service delivery) at the interconnect points of the network, MGCP/Megaco creates the "IP Central Office". This approach is seen as recreating the IN world or "PSTN over IP" thus precluding the potential and benefits of a new architecture. This is a contrast to the distributed service model of SIP and the world of the Internet.