Chaining and Loops

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.

Maximum Number of Forwards
The IP Office does not impose any maximum on the number of times a call can be forwarded.