Hi, Friends

I already have read a lot of descussions about this problen in forum, but I've not find the decision.

I have CUCM 9.1.2 and a lot of MGCP gateways with SRST and FXO ports, in SRST mode I can make outbound calls just fine. But when I try to make inbound call from PSTN on my FXO, I hear 'busy tone'. I use c2900-universalk9-mz.SPA.153-3.M.bin IOS on my routers.

Part of configuration:

application
 global
  service alternate Default
!
voice-port 0/0/0
 trunk-group FXO-Ports
 cptone RU
 timing hookflash-out 50
 timing guard-out 1000
 connection plar 164010
 caller-id enable
!
voice-port 0/0/1
 trunk-group FXO-Ports
 cptone RU
 timing hookflash-out 50
 timing guard-out 1000
 connection plar 164001
 caller-id enable
!
voice-port 0/0/2
 cptone RU
 timing hookflash-out 50
 timing guard-out 1000
 connection plar 164004
 caller-id enable
!
ccm-manager fallback-mgcp
ccm-manager redundant-host 192.168.103.37
ccm-manager mgcp
no ccm-manager fax protocol cisco
ccm-manager music-on-hold
ccm-manager config server 192.168.103.36  
ccm-manager config
!
mgcp
mgcp call-agent 10.0.32.3 2427 service-type mgcp version 0.1
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 inhibit
mgcp bind control source-interface GigabitEthernet0/1.20
mgcp bind media source-interface GigabitEthernet0/1.20
mgcp behavior rsip-range tgcp-only
mgcp behavior comedia-role none
mgcp behavior comedia-check-media-src disable
mgcp behavior comedia-sdp-force disable
!
mgcp profile default
!
sccp local GigabitEthernet0/1.20
!
dial-peer voice 999001 pots
 service mgcpapp
 port 0/0/1
!
dial-peer voice 999002 pots
 service mgcpapp
 port 0/0/2
!
dial-peer voice 999000 pots
 service mgcpapp
 port 0/0/0
!
call-manager-fallback
 secondary-dialtone 9
 max-conferences 8 gain -6
 transfer-system full-consult
 user-locale RU
 timeouts interdigit 15
 timeouts ringing 40
 ip source-address 10.5.164.124 port 2000
 max-ephones 15
 max-dn 60 dual-line
 system message primary SRST
 system message secondary SRST
 no huntstop
 time-format 24
 date-format dd-mm-yy

I have the same problem like the person in this topic https://supportforums.cisco.com/discussion/11884511/mgcp-srst-fxo-inbound-call-silence

Can you give any advice

Thank you