Allowing transfer of only incoming calls

[Deepesh D <deep.d2010@xxxxxxxxx>]

Hello,

Is there a way by which a SIP peer can only transfer an incoming call? 

When I set 'allowtransfer=yes' the peer is able to transfer both outgoing calls and incoming calls. Is there any SIP setting or dialplan setting by which I can restrict transfer of outgoing calls.  

The asterisk version I am using is 1.8.8.2 and the peers are using the SIP REFER method for transferring calls.

Thanks
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