Systems and methods for a communications transfer between internet protocol multimedia services and push to talk services

摘要

Systems (200) and methods for a full-duplex call transfer into a half-duplex call. The methods involve: establishing the first full-duplex call between a first communication device (214) and a second communication device (204) already engaged in the half-duplex call with at least one third communication device (206, 208); and communicating a REFER request message (306) from the second communication device to the first communication device. The REFER request message includes contact information for redirecting the first communication device to a hybrid application server and token information useful for patching the full-duplex call into the half-duplex call. In response to the REFER request message, the second communication device performs operations to terminate the first full-duplex call and establish a second full-duplex call with the hybrid application server. Thereafter, the hybrid application server performs operations to patch the second full-duplex call into the half-duplex call using the token information.

主权项

1. A method for a full-duplex call transfer into a half-duplex call, comprising:
establishing said first full-duplex call between a first communication device and a second communication device already engaged in said half-duplex call with at least one third communication device; communicating a REFER request message from the second communication device to the first communication device as part of a full-duplex call transmission over a full-duplex call infrastructure, said REFER request message including contact information for redirecting the first communication device to a hybrid application server and token information that is to be subsequently used to patch the full-duplex call into the half-duplex call without modification thereof; in response to the REFER request message, performing operations by the first communication device to re-direct a full-duplex call to the hybrid application server, said operations comprising
(1) terminating the first full-duplex call, and(2) establishing a second full-duplex call with the hybrid application server by using an INVITE message including the token information contained in the REFER request message without modification; and performing operations by the hybrid application server to patch the second full-duplex call into the half-duplex call using said token information contained in the INVITE message.