<div>
<div class="content wysiwyg-content">
I have connected using an FXS port on a cisco call manager express 2811 ISR an analog Polycom conference SoundSation. I need to configure the system to support initiating a conference call to other cisco ip Phones within the branch office and also to other phone users over an H323 connection at the HQ.<br />

</div>
</div>


I have connected using an FXS port on a cisco call manager express 2811 ISR an analog Polycom conference SoundSation. I need to configure the system to support initiating a conference call to other cisco ip Phones within the branch office and also to other phone users over an H323 connection at the HQ.


Help on Voice conferencing on Cisco Callmanger Express 4.2 system using a Polycom conference Station

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).