Acme Packet 4600
 

PLA-Support>Sun Systems>CommsGBU>Session Delivery Network>SN-SND: Acme Service Provider
 

SBC sending BYE message to both side of the call after 300 seconds.

In this Document

Symptoms

Cause

Solution

Created from <SR 3-13675004901>

Applies to:

Symptoms

Customer reports that chat session was getting closed after some time.

Wireshark traces showed that SBC was closing the session by sending BYE to both side of the call.

While troubleshooting this report, we suspected customer was using MSRP session for Instant Messaging hence asked them to modify following parameter under Media-Manager :

As per the ACLI Guide : t

cp-subsq-guard-timer
Allowable command values: 0 to 999999999 (seconds)
Default value: 300

Timer Expiration:
Initiates tear down of the TCP connection. In the possible, but unlikely event that the value assigned to this timer is less than the value assigned to the MSRP interval timer, expiration initiates forwarding of the delayed BYE request to the recipient MSRP endpoint and tear down of the TCP connection.

This did not resolve the behavior.

Cause

The customer chat session is established externally via UDP ports and only the signaling was going via SBC.   Since no media was received, SBC was sending the BYE after 300 seconds based on the initial-guard-timer = 300 seconds in Media-Manager.

Customer had the following configuration :

Solution

To resolve this behavior, customer was advised to configure the initial-guard-timer to a higher value and test.

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