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Calls between extension lines in the same local network are mute

Check the list of CODECs configured in the IP extension lines of the switch and in the terminals involved in the call.

If the terminals are using different CODECs, the switch will need to execute the transcoding of the audio. Disable the option "Allow Reinvites" in the configuration of the IP extension lines to force the audio of the call to pass by CIP 850.

Check the RTP range configured in the two terminals. The ranges should be configured equal to the range used by switch CIP 850.

Check the list of CODECs configured in the IP extension lines of the switch and in the terminals involved in the call.

If the terminals are using different CODECs, the switch will need to execute the transcoding of the audio. Disable the option "Allow Reinvites" in the configuration of the IP extension lines to force the audio of the call to pass by CIP 850.

Check the RTP range configured in the two terminals. The ranges should be configured equal to the range used by switch CIP 850.