I am trying to create a silent ringtone (no music) for cisco ip phones based on the specs given below. What is happening is the phone accepts the raw file (from the edited distinctive ring list). For every ring, there seems to be a clicking sound. Is there a way to fix it?
PCM File Requirements for Custom Ring Types
The PCM files for the rings must meet the following requirements for proper
playback on Cisco IP Phones:
â¢ Raw PCM (no header)
â¢ 8000 samples per second
â¢ 8 bits per sample
â¢ ulaw compression
â¢ Maximum ring size-16080 samples
â¢ Minimum ring size-240 samples
â¢ Number of samples in the ring evenly divisible by 240
â¢ Ring starts and ends at the zero crossing.
â¢ To create PCM files for custom phone rings, you can use any standard audio
editing packages that support these file format requirements.