PSTN E1 PRI switching between TEI Assigned and Awaiting Establishment

Hello,

On my PSTN router, I am seeing the E1 ISDN status switching between TEI_ASSIGNED and AWAITING_ESTABLISHMENT.  I have looked over my configs and I am unable to determine what the issue is. 

Below are the configs for both Branch 2 and the PSTN:

PSTN:

controller E1 0/3/0
 clock source internal
 pri-group timeslots 1-3,16
 description == Voice Circuit to Branch2(R3)
!
interface Serial0/3/0:15
 description == PRI Circuit to R3-BR2
 no ip address
 encapsulation hdlc
 isdn switch-type primary-net5
 isdn protocol-emulate network
 isdn incoming-voice voice
 isdn negotiate-bchan resend-setup
 no cdp enable

Branch 2:

controller E1 0/1/0
 pri-group timeslots 1-3,16 service mgcp

interface Serial0/1/0:15
 no ip address
 encapsulation hdlc
 isdn switch-type primary-net5
 isdn incoming-voice voice
 no cdp enable

I have had this working in the past, but don't know what I changed to make this unavaiable.

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