Blackberry Corporation

Research in Motion Corporation

Valentina Iqorevna Kramarenko

Boris Rozinov

Swee Tuan Pang

Mee Tchin Jane John Chuan

Mee Tchin John Chuan

Miranda Bing Ying Lim

Gibran Siddique

Brian Alexander Oliver

Richard John George

Zhigang Ruan

Ximing Zeng

Haiyang Yin

Lap Luu

Matthew David Douglas Williams

The present disclosure provides a system and method for applying authentication and security policies in a SIP environment. In accordance with one embodiment, there is provided a method for use on a SIP server, comprising: establishing a persistent connection with a user agent (UA); initiating an idle connection timeout countdown timer; performing authentication of an initial REGISTER request using a first level of authentication; and terminating the persistent connection when the initial REGISTER request is not validated before expiry of the idle connection timeout countdown timer.

System and method for applying authentication and security policies in a SIP environment

The present disclosure provides a system and method for Session Initiation Protocol (SIP) user agent identification and efficient binding. In accordance with one example embodiment, there is provided a method for use on a Session Initiation Protocol (SIP) registration server for registering user agents, comprising: receiving a REGISTER message which includes a binding key; determining whether a prior binding associated with the binding key exists in a registration repository; and creating a new binding associated with the binding key and adding the new binding to the registration repository when no prior binding associated with the binding key exists in the registration repository.

System and method for SIP user agent identification and efficient binding

A method that includes determining input-resolution parameters for an input resolution, receiving first and second output resolutions from an electronic device, wherein the first output resolution includes first output-resolution parameters and the second output resolution includes second output-resolution parameters, calculating a first value by using the input-resolution parameters and the first output-resolution parameters, calculating a second value by using the input-resolution parameters and the second output-resolution parameters, selecting one of the first and second output resolutions based on a comparison between the first and second values, providing the selected output resolution to the electronic device, and receiving a video stream from the electronic device, wherein the video stream has a resolution corresponding to the selected output resolution.

Comparison-based selection of video resolutions in a video call

Third party call control in a service management platform (SMP) of an enterprise system comprising a private branch exchange (PBX) in communication with the SMP over a trunk and line. Receiving a request over the line for communication involving a device. Invoking reliable transmission of provisional responses in the trunk. Receiving a receive only session description over the trunk. Invoking specific event notification between the SMP and PBX for calls answered between the device and PBX. Receiving notification of a call answered between the device and PBX. Responding to the request with the first session description as a send/receive offer. Receiving acknowledgement including a second send/receive answer session description over the line. Updating the trunk the second description as a send/receive update. Receiving a third session description with a successful response message from the PBX; the third session description being a send and receive copy of the first session description.

Expedited media interconnection in third party call control

A device and method are described for establishing a dialog between Internet Protocol (IP) end points using a peer-to-peer (P2P) architecture. The device, method and computer readable memory utilize servers to determine one or more possible addresses to attempt the dialog establish using. The device and methods described allow for an early discovery of an end point address which can be used for the dialog establishment.

Dialog establishment over a peer-to-peer architecture

A mobile device can send a notification to place a call using a PBX (e.g., using SIP signaling) or receive a notification of call availability for the mobile device at the PBX. An authentication token is provided over a data channel for use in authenticating the mobile device when calling the PBX on a voice channel. However, when the mobile device calls the PBX (e.g., on a DNIS number, where ANI information is made available to an application server), if ANI information is found to correspond to the mobile device, the PBX can send tone(s) indicating that the mobile device can respond with an abbreviated validation tone, rather than the entirety of the authentication token. If the ANI information is not obtained or not matched, then a different tone(s) is sent, indicating to provide the authentication token. If the authentication token provided does not match or if the mobile device does not respond, the voice channel is not set up.

Systems and methods of voice call setup involving mobile devices

A computer implemented method for transmitting dual tone multi-frequency (DTMF) tones is disclosed. The method includes sending an indication to a mobile device to start a cyclic ring tone including ring and pause periods. The delay incurred to send a DTMF tone to the mobile device is estimated. The server schedules the transmission of the DTMF tone to be received at the mobile device during a pause period of the cyclic ring tone and the DTMF tone is sent as scheduled.

System and method for the synchronized transmission of tone sequences

Aspects relate to provision of enterprise call capabilities to mobile devices. For example, a mobile device can indicate, over a data channel, that a PBX is to make a call on its behalf to a called party. The PBX can call back the mobile device, call the called party, and bridge those call legs to establish the call. The mobile device can employ mechanisms that a particular incoming call is made by the PBX. These mechanisms can include using ANI information, sending, and receiving audible verification codes over the voice channel established after answering the incoming call. The verification codes can be selected based different behaviors of the mobile devices.

Error correction for DTMF corruption on uplink

Control and status information between a mobile device and another device can be signaled over a voice channel using DTMF tones, e.g., a pre-defined sequence of DTMF tones can signal a desired message (more generally, a feature code). Tones sent are separated from each other by a time gap (Ttimer). If a receiving device does not receive a sequence of DTMF tones that can be matched to stored definitions of feature codes, then the receiving device generates a negative ACK. Also, if the sending device does not receive either negative or positive ACK, then sending device resends all tones of the feature code after a retry delay (Ttimer). Rather than having the Ttimer start when tones for a feature code start to be transmitted, the Ttimer is started after the Ttimer expires for the last tone of a feature code. Thus, only one timer is running (either Tor T), rather than having multiple timers running concurrently. Race conditions between the timers are avoided.

Systems and methods of timing DTMF tones for telephony control

Mobile devices use a PBX and application servers associated with the PBX to access voice services. Some mobile devices can support simultaneous data and voice channels, with the PBX and application server respectively. Where a data channel is unavailable, a control and status updating mechanism is needed. One approach is to signal over the voice channel with DTMF tones. DTMF tones should be timed to cause the tones to arrive at the mobile device during a pause period of a ring cycle. However, it also is desirable to avoid unnaturally long silence periods or other pauses during system usage. Aspects relate to enhancing a user experience in these situations and successful transmission/reception of control and status information over a voice channel using DTMF tones.

Growing community of inventors

Toronto, Canada

Valentina Iqorevna Kramarenko