Delays on calling or receiving calls by VPN-Less jabber

Hi Team,
We are facing delays on calling or receiving calls by jabber, that the user will end the call and then we will get the notification.
For example, i got a call from somebody, I answered the call after 15 seconds it starts ringing in my mobile J
pls advise solution for the same??

Example further.
Please describe the devices and protocols involved in the call scenario for further inspection.

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Level: ERROR
Flag: N/A
Function: N/A
Source: N/A
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Sequence# : 00000373
CorrelationId : N/A
ThreadId : 1138
ProcessId : 1134
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Flag: N/A
Function: N/A
Source: N/A
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Sequence# : 00000374
CorrelationId : N/A
ThreadId : 1138
ProcessId : 1134
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Sequence# : 00000375
CorrelationId : N/A
ThreadId : 1138
ProcessId : 1134
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Was checking the logs on the SX10 itself, appears to be reporting the same thing about 503 Service Unavailable, I had the logging on it set to "Extended Logging"
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Line 1113: Sep 10 15:24:56.367 a9 appl[1529]: 6097.58 CuilApp   User admin(1001) about to execute command '/Phonebook/Search ContactType: any Limit: 100 Offset: 0 PhonebookType: local SearchString: [email protected]' from 10.1.99.198.
Line 1114: Sep 10 15:24:56.375 a9 appl[1529]: 6097.58 CuilApp   User admin(1001) about to execute command '/CallHistory/Recents DetailLevel: Full Limit: 100 Offset: 0 SearchString: [email protected]' from 10.1.99.198.
Line 1115: Sep 10 15:24:56.384 a9 appl[1529]: 6097.59 CuilApp   User admin(1001) about to execute command '/Phonebook/Search ContactType: any Limit: 100 Offset: 0 PhonebookType: corporate SearchString: [email protected]' from 10.1.99.198.
Line 1117: Sep 10 15:24:58.634 a9 appl[1529]: 6099.84 CuilApp   User admin(1001) about to execute command '/Dial callType: Video number: [email protected]' from 10.1.99.198.
Line 1125: Sep 10 15:24:59.154 a9 appl[1529]: 6100.36 MainEvents I: OutgoingCallInvoked(p=3) remoteURI='sip:[email protected]' localURI='sip:[email protected]' bookingID=''
Line 1164: Sep 10 15:24:59.859 a9 appl[1529]: 6101.07 MC I: CallParticipant: calledUri: sip:[email protected]
Line 1190: Sep 10 15:24:59.890 a9 appl[1529]: 6101.10 SipPacket   INVITE sip:[email protected] SIP/2.0
Line 1196: Sep 10 15:24:59.892 a9 appl[1529]: 6101.10 SipPacket   To: <sip:[email protected]>
Line 1295: Sep 10 15:24:59.960 a9 appl[1529]: 6101.17 SipPacket   To: <sip:[email protected]>
Line 1306: Sep 10 15:24:59.967 a9 appl[1529]: 6101.18 SipPacket   To: <sip:[email protected]>;tag=1393374~8642d04e-70cd-49a5-b73c-5ca5fe21b218-48171693
Line 1313: Sep 10 15:24:59.970 a9 appl[1529]: 6101.18 SipPacket   ACK sip:[email protected] SIP/2.0
Line 1318: Sep 10 15:24:59.972 a9 appl[1529]: 6101.18 SipPacket   To: <sip:[email protected]>;tag=1393374~8642d04e-70cd-49a5-b73c-5ca5fe21b218-48171693
Line 1328: Sep 10 15:24:59.979 a9 appl[1529]: 6101.19 MainEvents I: CallDisconnectRequested(p=3) remoteURI='sip:[email protected]' cause=[normal('') 'LocalDisconnect']
Line 1333: Sep 10 15:24:59.986 a9 appl[1529]: 6101.19 MainEvents I: CallDisconnected(p=3) remoteURI='sip:[email protected]' causeToLocal=[disconnected('Service Unavailable') 'RemoteDisconnect'] causeToRemote=[normal('') 'LocalDisconnect']

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