<div>
<div class="content wysiwyg-content">
Dear Experts<br />
<br />
I am having PBX1 server in HO and also PBX2 at branch office both are running asterisk and connectivity between HO and branch office with MPLS, &nbsp;if call is forwarded from extension of PBX1 to extension of PBX2 and if extension at PBX2 is busy or unavailable will it be possible to switch to next available extension at PBX2 side, please suggest if yes then how we can achieve this.
</div>
</div>


Dear Experts

I am having PBX1 server in HO and also PBX2 at branch office both are running asterisk and connectivity between HO and branch office with MPLS,  if call is forwarded from extension of PBX1 to extension of PBX2 and if extension at PBX2 is busy or unavailable will it be possible to switch to next available extension at PBX2 side, please suggest if yes then how we can achieve this.

call forward from between 2 pbx server and switch if user is busy or unavailable

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).

Voice Over IP

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

Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.