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Cisco Bug: CSCtc03451 - TCP SIP Call Dropped When Resuming from Hold Due to Incorrect Timeout

Last Modified

Nov 09, 2016

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

8.0(4.42) 8.2(1.4)

Description (partial)


When using Transmission Control Protocol (TCP) based Session Initiation Protocol (SIP) across an Adaptive Security Appliance (ASA) or PIX Firewall with SIP Inspection enabled, calls may terminate when being resumed from Hold or during other control operations.


1. TCP-based SIP is used.
2. SIP Inspection is enabled.
3. Secondary SIP connections are used during Hold/Resume or other similar control operations.


1. Enable Dead Connection Detection (DCD) feature for all connections between the affected SIP endpoints or just for SIP control port (TCP/5060 by default) traffic.

2. If no Network Address Translation (NAT) is used and the Access Control Lists (ACLs) are open for the SIP control and RTP media traffic in question, disable SIP Inspection.
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