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Unity xfer to Phone fails on off hook - From SIP provider

I have a CUCM-CUC setup as follows

CUCM and CUC 10.0.1.10000-24

Cisco 2821 (revision 1.0) with 1030144K/18432K bytes of memory.

Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 15.1(4)M8, RELEASE SOFTWARE (fc2)

Processor board ID FTX1219A1XM 2 Gigabit Ethernet interfaces

1 Virtual Private Network (VPN) Module

2 Voice FXO interfaces DRAM configuration is 64 bits wide with parity enabled.

239K bytes of non-volatile configuration memory.

253008K bytes of ATA CompactFlash (Read/Write)

 

We use Vitelity as our SIP provider. This service enables 4 calls on one DID

 

Here is a small piece of CLI

dial-peer voice 91 voip

 tone ringback alert-no-PI

 destination-pattern nnnnnnnnnn

 progress_ind setup enable 3

 session target ipv4:xxx.xxx.xxx.xxx

 incoming called-number .

 voice-class codec 1  

 voice-class sip dtmf-relay force rtp-nte

 dtmf-relay rtp-nte cisco-rtp h245-alphanumeric

 no vad

 

sip-ua credentials username hhhhhh password p pppppppppppppp realm asterisk

 

Here is the problem

Calls come in to CUC and the IVR treatments work. When CUC IVR picks the call I can use DTMF on the calling device to select an internal DN. I see CLID and the number calling on the Phone a 7975. When I pick up the call there is silence and then the call drops. Same thing happens when the call is not answered and attempts to go to CUC to leave a VM.

I can place calls out all day long and things are good. There are very sporadic calls not connected.

 

If I go into the Dial Peer and delete a line and then add that line back then calls work. Give it about 5-10 minutes or so and the calls fail as described above

 

Suggestions are welcomed

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