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SRTP - RTP PORTS NEGOCIATION - ONE WAY AUDIO

Hello,

I'm have the following scenery:

PSTN - AS5400 gateway - IP Network - CUCM 7.1 - Phone.

Calls are encrypted. Sometimes (30-40% of the cases), RTP ports that gateway and phone use are not equal, so I have one-way audio problems:

GATEWAY

No. CallId     dstCallId  LocalRTP RmtRTP LocalIP                                RemoteIP                              
1   642        641        18236    20144  10.255.27.4                            10.255.22.60                          
Found 1 active RTP connections

PHONE

(In Spanish)

Dirección remota   10.255.27.4/18236
Dirección local  10.255.22.60/20152

You can see IP Phone is waiting RTP packets in port UDP 20152, not 20144.

In this "debug ip packet" you can see perfectly the problem:

*Jul 12 18:23:59.721: IP: s=10.255.22.60 (FastEthernet0/0), d=10.255.27.4 (Serial0/0/0), g=10.255.27.4, len 64, forward
*Jul 12 18:23:59.721:     UDP src=16466, dst=22240
*Jul 12 18:23:59.733: IP: tableid=0, s=10.255.27.4 (Serial0/0/0), d=10.255.22.60 (FastEthernet0/0), routed via RIB
*Jul 12 18:23:59.733: IP: s=10.255.27.4 (Serial0/0/0), d=10.255.22.60 (FastEthernet0/0), g=10.255.22.60, len 64, forward
*Jul 12 18:23:59.733:     UDP src=22240, dst=16456
*Jul 12 18:23:59.741: IP: tableid=0, s=10.255.22.60 (FastEthernet0/0), d=10.255.27.4 (Serial0/0/0), routed via RIB
*Jul 12 18:23:59.741: IP: s=10.255.22.60 (FastEthernet0/0), d=10.255.27.4 (Serial0/0/0), g=10.255.27.4, len 64, forward
*Jul 12 18:23:59.741:     UDP src=16466, dst=22240
*Jul 12 18:23:59.753: IP: tableid=0, s=10.255.27.4 (Serial0/0/0), d=10.255.22.60 (FastEthernet0/0), routed via RIB
*Jul 12 18:23:59.753: IP: s=10.255.27.4 (Serial0/0/0), d=10.255.22.60 (FastEthernet0/0), g=10.255.22.60, len 64, forward
*Jul 12 18:23:59.753:     UDP src=22240, dst=16456

In CCM traces I CAN SEE BOTH PORTS!!!!

CCM|StationInit: (0004827) OpenReceiveChannelAck Status=0, IpAddr=IpAddr.type:0 ipAddr:0x0aff163c000000000000000000000000(10.255.22.60), Port=16456, PartyID=33630365|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::State Transition><MASK::0020>
07/12/2010 18:16:07.764
CCM|StationCdpc(47126): StationCtiCdpc - StationOpenReceiveChannelAck CH=2|46864876
StationPid=(7,100,40,4827)|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0800>
07/12/2010 18:16:07.764 CCM|StationD(4827): StationCtiD - CtiStartReceptionNotify
CI=46864876|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0800>
07/12/2010 18:16:07.767 CCM|LineCdpc(47295): -dispatchToAllDevices-, sigName=CcNotifyReq, device=SEPFCFBFBCAD8B1|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0800>
07/12/2010 18:16:07.767 CCM|StationD(4827): StationCtiD - CcNotifyReq
CI=46864876|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0800>
07/12/2010 18:16:07.767 CCM|StationCdpc(47126): StationCtiCdpc - CcNotifyReq CH=2|46864876 CmSsFeature=1 ReasonForRedirection=0 OnBehalfOf=Device CallReason=1 CallInfo.LineId.DN= CallInfo.lineId.part= LineId.DN= lineId.part=|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0800>
07/12/2010 18:16:07.767 CCM|StationCdpc(47126): StationCtiCdpc - sendCallSecurityStatusUpdateNotify
CH=2|46864876|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0800>
07/12/2010 18:16:07.767 CCM|StationCdpc(47126): StationCtiCdpc - isAlertingToneOn Q931Signal.l=0 Q931Signal.sv=0|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0800>
07/12/2010 18:16:07.767 CCM| StationCdpc: star_CcNotifyReq - CallSecurityStatus = 3 |<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0020>
07/12/2010 18:16:07.767 CCM|StationD(4827): StationCtiD - StationOutputCallInfo|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::Detailed><MASK::0800>
07/12/2010 18:16:07.767 CCM|StationD:    (0004827) (7,100,13,7302) CallInfo callingPartyName='' callingParty=607502248 cgpnVoiceMailbox=    alternateCallingParty= 607502248    calledPartyName='OPERADOR 4 - 514886' calledParty=514886 cdpnVoiceMailbox=    originalCalledPartyName='OPERADOR 4 - 514886' originalCalledParty=514886 originalCdpnVoiceMailbox= originalCdpnRedirectReason=0    lastRedirectingPartyName='OPERADOR 4 - 514886' lastRedirectingParty=514886 lastRedirectingVoiceMailbox= lastRedirectingReason=0    callType=1(InBound) lineInstance=1 callReference=46864876. version: ad720011|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503259><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::State Transition><MASK::0020>
07/12/2010 18:16:07.935
CCM|StationInit: (0004827) OpenReceiveChannelAck Status=0, IpAddr=IpAddr.type:0 ipAddr:0x0aff163c000000000000000000000000(10.255.22.60), Port=16466, PartyID=33630365|<CLID::StandAloneCluster><NID::10.255.27.3><CT::7,100,39,1.7503261><IP::10.255.22.60><DEV::SEPFCFBFBCAD8B1><LVL::State Transition><MASK::0020>
07/12/2010 18:16:07.935

Any idea? Thanks!!!

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