US 12,425,516 B2
Indication of tone support via format specifier
Anish Kavia, Slough (GB); Salem Amin Al-Damluji, Chorleywood (GB); and Ranabahu Mudiyanselage Janaka Chandimal Ranabahu, Enfield (GB)
Assigned to MICROSOFT TECHNOLOGY LICENSING, LLC, Redmond, WA (US)
Filed by MICROSOFT TECHNOLOGY LICENSING, LLC, Redmond, WA (US)
Filed on Sep. 30, 2022, as Appl. No. 17/958,165.
Prior Publication US 2024/0114092 A1, Apr. 4, 2024
Int. Cl. H04M 3/42 (2006.01); H04L 65/1069 (2022.01); H04L 65/1104 (2022.01)
CPC H04M 3/42391 (2013.01) [H04L 65/1069 (2013.01); H04L 65/1104 (2022.05)] 16 Claims
OG exemplary drawing
 
1. A method of managing communications sessions in a communications network configured to support teletypewriter (TTY) and audio communications sessions, the method comprising:
receiving, by a device in the communications network from a first endpoint, a Session Initiation Protocol (SIP) message containing a session description protocol (SDP) offer for a communications session, the SDP offer having an SDP formatted header including a first parameter in an attribute line of the header indicating whether the communications session will include media encoding TTY data, audio data, or both TTY data and audio data;
reading, by the device, the first parameter indicating whether the communications session will include media encoding TTY data, audio data, or both TTY data and audio data;
based on the first parameter, determining that the first endpoint supports the media contained in the communication session being offered;
based on the determining that the first endpoint supports the media contained in the communication session being offered, sending, by the device, an SDP answer having the SDP formatted header including a second parameter indicating whether the device is configured to process media encoding TTY data, audio data, or both TTY data and audio data; and
establishing the communications session between the device and the first endpoint as offered in the SIP message.