Chaining is the process where a call forward to an internal user destination is further forwarded by that user's own forwarding settings.
Follow Me Calls
Follow Me calls are not chained. They ignore the forwarding, Follow Me and Do Not Disturb settings of the Follow Me destination.
Voicemail
If the call goes to voicemail, the mailbox of the initial call destination before forwarding is used.
Looping
When a loop would be created by a forwarding chain, the last forward is not applied. For example the following are scenarios where A forwards to B, B forwards to C and C forwards to A. In each case the final forward is not used as the destination is already in the forwarding chain.
Hunt Group Loop
If a user forwards a call to a hunt group of which they are a member, the group call is not presented to them but is presented to other members of the hunt group.
Maximum Number of Forwards
A maximum of 10 forwarding hops are supported for any call.
Calls Forwarded
Once a call has been forwarded to an internal destination, it will ignore any further Forward No Answer or Forward on Busy settings but may follow additional Forward Unconditional settings.