Add the following advanced SIP variable. Disabling this allows Yealink phones to display the SIP error reason in the format sent by the carrier rather than Q.850 format e.g. "User Busy" rather than "NORMAL_CLEARING"
sip.call_fail_use_reason.enable = {$yealink_sip_call_fail_use_reason_enable}
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| .. | ||
| conf | ||
| engine/smarty | ||
| provision | ||