SIP Commander - free portable softphone

SIP 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.

SIP 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 SIP 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 SIP 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, SIP 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.

What Is SIP? IMPP Instant Messaging and Presence
What Is SIP? IMPP Instant Messaging and Presence
> ABOUT SIP > RELATED PROTOCOLS > IMPPIMPP

Instant Messaging and Presence - the IMPP working group

The IMPP is the standards committee behind the IM world, chief contributors being AOL, Microsoft et al.

Much confusion surrounds the efforts to standardise on an IM protocol. Different IM communities have appeared and, other than some work to make AOL and Microsoft interoperate with ICQ, little progress had been made until recently. IMPP has now established the requirements for a standard protocol and, in CPIM (a Common Profile for Instant Messaging) it sets out an architecture and discusses server-to-server interoperability in a multi-protocol environment.

SIP is one of three proposed protocols in the IETF's IMPP working group - the others being PRIM and APEX (formerly IMXP).

PRIM and APEX are both designed specifically for the needs of IM whereas SIP would require some extensions to fulfil the requirements of the IMPP working group. PRIM takes as its starting point the idea that a standard protocol should be based on the existing proprietary architectures for IM; APEX does IM and presence on top of a BEEP (Blocks Extensible Exchange Protocol) mesh - an XML protocol.

Due to the obvious need for presence to be used in voice communications, SIP is a strong contender as the mechanism by which users and applications communicate their presence data to and from the network. The PRIM group have acknowledged this and allow the possibility of interfacing with SIP for voice applications. The strongest argument for SIP is probably that of convergence: the other initiatives require an IM-specific infrastructure. SIP, of course, can also be used for many other purposes. Significant in this respect is the decision by Microsoft to adopt SIP for real-time communications on the .NET framework.

The CPIM document shows that some consensus is being reached. A likely outcome, however, is that each of the groups will pursue their own protocol but will support base-level interoperability.

Further information can be found on the IMPP Products and Services