V8: Preferences → CallForwarding
V10: Identity → Features → CallForwarding → Busy → Target
Menu → Call Features → Call Forwarding → Forward when Busy → Target
8.7.4
Specifies the target number, where all calls will be diverted to, when Call Forwarding Busy (CFB) becomes activated.
Call Waiting must be disabled for this identity.
A SIP contact or telephone number, e.g. John Doe <sip:jd@register.com>.
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