Consider the following scenario in Microsoft Skype for Business Server 2015:
In this situation, the forwarding from SLA to User C fails.
- You set up forwarding on Shared Line Appearance (SLA) group Missed Call Option to User C if SLA is busy by using the Set-CsSlaConfiguration cmdlet.
- User A calls User B.
- User B forwards the call to SLA.
This issue occurs because the Invite sent when call is forwarded by SLA contains both Referred-By headers.