Why does the router consider the VoiceEncapPeer an interface

I have MC3810 and 26xx routers running VOFR and VOIP. My network management stations sees the VoiceEncapPeer and VoiceIPPeer go down and then back up. Are these actual interfaces and what is causing the peer to flap.

If this is what you management station says, then the
only option is someone did a shutdown , no shutdown on the
dial-peer for vofr and voip.
Interface up/down does not affect the admin or operational state
of voice dial-peers.

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