[cisco-voip] Loss of RTP

[Ryan Ratliff]

When you put someone on hold and resume them it sets up an entirely  
new RTP stream (different ports, etc).

If the users hit the i or ? button on the IP phone twice it will  
bring up packet counters for the current call.  Have them do this  
when the problem occurs and note whether the Rx counters are  
incrementing for the phone that cannot hear anything.  That will give  
you a clue where to look.

-Ryan

On Jan 30, 2007, at 9:19 AM, Lemon wrote:

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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