[cisco-voip] sip call disconnects every 29min 45 sec

[Lee]

SIP Provider is Paetec. CCM7 to 2821 Router running Cube to Provider.  Using
Trunk from CCM7 to Cube.

voice service voip
 allow-connections sip to sip
 no supplementary-service sip moved-temporarily
 no fax-relay sg3-to-g3
 h323
 sip
  header-passing error-passthru
  early-offer forced
  midcall-signaling passthru
  min-se 1700
!
!
voice class codec 1
 codec preference 1 g711ulaw
 codec preference 2 g729r8

dial-peer voice 1000 voip
 destination-pattern 1[2-9]..[2-9]......
 voice-class codec 1
 no  voice-class sip localhost
 no voice-class sip outbound-proxy
 voice-class sip early-offer forced
 session protocol sipv2
 session target sip-server
 incoming called-number ....
 dtmf-relay rtp-nte
 ip qos dscp cs3 signaling

dial-peer voice 8031 voip
 preference 3
 destination-pattern 803.......
 voice-class codec 1
 no voice-class sip outbound-proxy
 session protocol sipv2
 session target ipv4:192.168.xx.21
 dtmf-relay rtp-nte

sip-ua
 credentials username xxxxxxxxxx password 7 xxx445415F realm none
 authentication username xxxxxxxxxx password 7 xxx756085F
 no remote-party-id
 retry invite 2
 retry register 10
 timers connect 100
 registrar ipv4:172.31.255.37 expires 3600
 sip-server ipv4:172.31.255.37
 presence enable

I've done test calls during the day & after hours - all calls drop after 29
min 45 sec. Any suggestions?

Lee
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