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We've succesfully connected an Asterisk PBX to a Panasonic Hybrid Phone System. The Asterisk server uses the AVM Fritz PCI card to make the connection. When we make a call through the Asterisk server to a phone that is connected to the Panasonic phone system and the receiving end tries to transfer the call to another phone (also connected to the Panasonic), we get a busy tone. Any ideas to solve this problem? <br />
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Thx.
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We've succesfully connected an Asterisk PBX to a Panasonic Hybrid Phone System. The Asterisk server uses the AVM Fritz PCI card to make the connection. When we make a call through the Asterisk server to a phone that is connected to the Panasonic phone system and the receiving end tries to transfer the call to another phone (also connected to the Panasonic), we get a busy tone. Any ideas to solve this problem? 

Thx.

Call Transfer over Asterisk

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).