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One-way Audio issue on transfer

Hi All

I currently have an issue where when a call comes in via PSTN from a specific number and the call is transferred to another internal extension One way audio happens. It appears that after the transfer the transferred caller can no longer hear any audio. MTP is not being used. When I tried Enabling MTP one way audio happened on all the calls. Attached is a packet capture of the One way audio call and call details are listed below. Any help would be very much appreciated = Voice Gateway = Call Manager = Extension 604 = Extension 605

Call details:
Calling party: 99720265
Called party: 92760604 (Ext 604)
Transferred to: (Ext 605)