Ring should start and end at the zero crossing.Number of samples in the ring must be evenly divisible by 240.The PCM files for the rings must meet these requirements for proper playback on Cisco IP Phones: The PCM files must comply with these format guidelines. Create a PCM file for each custom ring (one ring per file). To create a custom phone ring, perform these steps: Note: This only applies to creating custom phone rings for the Cisco IP Phone 79 models. This application note describes how you can customize the phone ring types available at your site by creating your own PCM files and RingList.xml file. An Extensible Markup Language (XML) file (named RingList.xml) that describes the ring list option available at your site is needed on the Flash of the Cisco IOS Telephony Services (ITS) router. Cisco CallManager Express is also implemented to support custom ring sounds that are implemented in software as Pulse Code Modulation (PCM) files. Cisco IP Phones ship with two default ring types that are implemented in hardware: Chirp1 and Chirp2.
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March 2023
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