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Cisco Bug: CSCsy85020 - Shared TCP connections does not support shared line or bulk reg

Last Modified

Mar 02, 2018

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

7.0 7.1 8.0

Description (partial)

SIP devices registering with CUCM normally use a dedicated TCP connection between the device and CUCM. However, it is possible to share a TCP connection with multiple devices. An example of such a topology is a gateway hosting multiple SIP endpoints. However, none of the devices sharing a TCP connection can register the same DN, as might be the case with a shared line. If any device attempts to register the same DN as another device sharing the same connection, calls may not work on one or the other device.

Furthermore, shared TCP connections do not work if the endpoint is using the bulk registration feature.

This problem only occurs on SIP devices using shared TCP connections. Shared TCP connections is only supported in CUCM version 7.0 and beyond.
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