[cisco-voip] Loss of RTP

[Lemon]

Hi,

Got remote site with 2801 and 6 users. When these users phone HQ over the
WAN they sometimes loose the audio (remote site can't hear HQ but HQ can
still hear remote site) and this happens intermittent. Funny thing is that
if remote site puts HQ user on hold when there is no audio nad take them off
hold - normal audio works both ways again. All other Remote sites does not
have this problem. Remote site 2801 has following config running
c2801-ipvoice-mz.124-4.T5.bin IOS:



voice-card 0
!
!
voice call send-alert
voice call carrier capacity active
voice rtp send-recv
!
voice service voip
 h323
!
voice class codec 1
 codec preference 1 g729r8
 codec preference 2 g711ulaw
!
!
voice class codec 1
 codec preference 1 g729r8
 codec preference 2 g711ulaw
!
!
interface Multilink1
 bandwidth 512
 ip address x.x.x.x 255.255.255.252
 ip tcp header-compression iphc-format
 no ip mroute-cache
 no cdp enable
 ppp multilink
 ppp multilink interleave
 ppp multilink group 1
 ppp multilink fragment delay 20
 service-policy output Voice-QOS
 ip rtp header-compression iphc-format
!
!
interface FastEthernet0/1/0
 spanning-tree portfast
 service-policy output AutoQoS-Policy-Trust
!
interface FastEthernet0/1/1
 spanning-tree portfast
 service-policy output AutoQoS-Policy-Trust
!
!
interface Serial0/2/0
 bandwidth 512
 no ip address
 ip pim sparse-dense-mode
 encapsulation ppp
 no ip mroute-cache
 load-interval 30
 ppp multilink
 ppp multilink group 1
!
!
ip access-list extended SIGNALING
 permit tcp any any range 2000 2002
 permit tcp any any eq 1859
 permit tcp any any eq 1659
 permit tcp any any range 2427 2428
 permit tcp any any eq 2727
 permit tcp any any eq 1300
 permit tcp any any range 1718 1720
 permit tcp any any range 11000 11999
 permit udp any any eq 1300
 permit udp any any range 1718 1720
 permit udp any any range 2427 2428
 permit tcp any range 2000 2002 any
 permit tcp any eq 1859 any
 permit tcp any eq 1659 any
 permit tcp any range 2427 2428 any
 permit tcp any eq 2727 any
 permit tcp any eq 1300 any
 permit tcp any range 1718 1720 any
 permit tcp any range 11000 11999 any
 permit udp any eq 1300 any
 permit udp any range 1718 1720 any
 permit udp any range 2427 2428 any
 permit udp any any eq 11720
 permit udp any eq 11720 any
ip access-list extended VOICE
permit udp any range 16384 32767 any range 16384 32767
!

and the HQ router has the following running c3640-is-mz.122-1a.bin IOS:

class-map match-any VoIP_Control_X
  match ip dscp 24
  match ip dscp 26
!
class-map match-any VOIP_Bearer_X
 match ip dscp 46
!
policy-map Voice-QOS_X
  class VoIP_Control_X
   bandwidth 26
  class VOIP_Bearer_X
    priority 160
  class class-default
   fair-queue
!
interface Multilink4
 description Link to X
 bandwidth 512
 ip address x.x.x.y 255.255.255.252
 no ip route-cache cef
 ip tcp header-compression iphc-format
 no ip mroute-cache
 service-policy output Voice-QOS_X
 no cdp enable
 ppp multilink
 ppp multilink fragment-delay 20
 ppp multilink interleave
 multilink-group 4
  ip rtp header-compression iphc-format
!


Any ideas???

Thnx

Lemon
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