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DTMF lost sometimes

Hi All,

Some of our cisco phones users at CCM 4.2 sometimes loose digits when trying to enter DTMF tones to join a conference call (using the PSTN directly or over a PRI connection with a Nortel PBX internally) for example any ideas?

The voice gateway is a 2801 , the following is part of the configuration:

isdn switch-type primary-net5
isdn gateway-max-interworking
!
voice-card 0
dsp services dspfarm
!
!
voice rtp send-recv
!
voice service voip
h323
!
!

interface Serial0/1/0:15
no ip address
isdn switch-type primary-qsig
isdn incoming-voice voice
isdn bind-l3 ccm-manager
no cdp enable

voice-port 0/1/0:15
cptone GB

mgcp
mgcp call-agent XXXX  2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
no mgcp package-capability res-package
mgcp package-capability sst-package
no mgcp package-capability fxr-package
mgcp package-capability pre-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp rtp payload-type g726r16 static
!
mgcp profile default
!
sccp local FastEthernet0/0
sccp ccm 10.x.x.x identifier 1 version 4.1
sccp
!
sccp ccm group 999
associate ccm 1 priority 1
associate profile 2 register Exp-Transcode
!
!
gateway
timer receive-rtp 1200

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