Unable to transfer calls to hunt group, conference extensions through Auto Attendant.

Precondition:
1. Users 330, 331 and 144 are registered to SCS
2. Add a hunt group with extension 555 having users 331 and 144 with following call sequence:
    Initially call 331 for 30 sec
    If no response 114 for 30 sec

Steps to reproduce:
1. From 330, dial 100
2. When the auto attendant prompt, prompts for party's extension , enter the hunt group extension 555

Expected Result:
The prompt 'Please hold while I transfer your call" should be heard and the call should be transfered to users in the hunt group.

Actual Result:
The call is not transfered and the prompt "That extension is not valid" is played followed by the auto attendant prompt.
Call-Id: 94be0498-b01902d8-13c4-3a5-79ecfea0-3a5

Observation:
1. Transferring the call through auto attendant to any other SCS extension works as expected.
2. This issue occurs for virtual lines like hunt group extension, conference extension, possibly even for ACD line(not tested due to XCF-3106)
3. This scenario works as expected in 3.10.3-014059