With the Cisco Call Manager w/ CUBE, the CUBE is not passing UPATE messages to the Call manager. Thus, the CUCM will disconnect the call after 30 minutes, since no UPDATE was received. The CUBE must remove the UPDATE in the "Allow-Header" field.
This command will remove the UPDATE from any request or response message type:
voice class sip-profiles 1
request ANY sip-header Allow-Header modify ", UPDATE" ""
response ANY sip-header Allow-Header modify ", UPDATE" ""
The "voice-class sip profiles 1" must be applied to the dial peer facing PAETEC. In this example we are using dial-peer 9000
dial-peer voice 9000 voip
voice-class codec 1
voice-class sip localhost dns:astrial.pe.mcleodusa.n
voice-class sip outbound-proxy ipv4:xx.xx.xx.xx
voice-class sip early-offer forced
voice-class sip profiles 1
session protocol sipv2
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