When using indoor models c, i, v and p as Intercom with SIP phones, cracking noise might appear on SIP phone.
Increasing the “Duration” of the “Intercom Settings” in the configuration is a way to get rid of the noise.
To do this
- open the cameras configuration editor (/admin/showconfig?edit)
- search for the entry “mutetime1” in section “audionotify”
- a value of 30000 turned out to silence the noise completely
- “Accept” the changes
- got to the “Incoming Calls Settings” (admin/audio_callin)
- the value is now shown as the selected entry in the “Duration” selection
- click the “Set” button to activate the setting
- adjust the value starting in steps of 5000 if necessary