Guest

Preview Tool

Cisco Bug: CSCun50243 - fax calls fail if fax tones are detected in Early Media

Last Modified

Feb 14, 2018

Products (106)

  • Cisco IOS
  • Cisco 1812 Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 1803 Integrated Services Router
  • Cisco VG224 Analog Voice Gateway
  • Cisco 888W Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
View all products in Bug Search Tool Login Required

Known Affected Releases

15.1(4)M5

Description (partial)

Symptom: When CED/ANSam/2100Hz answer tone is detected in the early media phase of the call, the gateway does not switchover and starts sending distorted audio to the originating fax. Fax transmission fails.
Conditions: This symptom is observed when modem passthrough nse codec g711ulaw is used as the fax protocol.
Fax -> VG224 --SCCP--> CUCM -SIP--> 3945 GW--ISDN T1 PRI-->PSTN
3945 IOS: 15.1.4M5
VG224:15.1.4M2
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.