Cisco Bug: CSCul24898 - 8900/9900 Series IP Phone Sends malformed FROM header in SIP REGISTER

Last Modified

Nov 27, 2020

Products (1)

Cisco Unified IP Phones 9900 Series

Known Affected Releases

9.3(4.24)

Description (partial)

Symptom:
8900/9900 IP phone unregisters after ending a call and will not re-register.

Conditions:
- Call was placed to a shared line
- There was no caller-ID information sent by the provider for this call
- Call was held on another phone and then resumed from the phone that unregistered.

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