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Cisco Bug: CSCus49319 - ESRST Resume failure on mixed shared lines

Last Modified

Dec 13, 2018

Products (96)

  • Cisco IOS
  • Cisco 2951 Integrated Services Router
  • Cisco 898 Secure G.SHDSL EFM/ATM with Multi-Mode 4G LTE ISR Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 892W Integrated Services Router
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Known Affected Releases


Description (partial)

Resuming a call on a shared line in ERST fails when the call is placed on hold by a SIP phone and an attempt to resume is performed on a SCCP phone.

A shared line is configured on both SCCP and SIP phones. 
Both SIP and SCCP phones failover to ESRST on an IOS gateway
IOS 15.4(3)M and later is impacted
Failure occurs when call is answered by SIP phone and an attempt at resuming the call is made by SCCP phone. 
If SCCP phone places a call on hold, it can be resumed by SIP phone.
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