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After a User Does Not Place the Phone on the Hook for a Long Time and Then Places the Phone on the Hook, No Dial Tone Can Be Heard When the User Takes the Phone off the Hook

Publication Date:  2012-07-25 Views:  31 Downloads:  0
Issue Description
Description: In the supplementary voice service of the MA5620E that functions as the MDU, a user does not place the phone on the hook for a long time. After the user places the phone on the hook and then takes the phone off the hook, no dial tone can be heard.
Versions: SOFTX3000: V300R006B03D050SP28Hotpatch07
SE2300: V200R005C03B047
Networking: SoftX3000--SE2300--MA5680T--MDU (MA5620E)--voice users 
Alarm Information
Null
Handling Process
1. Capture packets on the upstream port of the MA5620E and trace signaling on the SoftX3000.
2. Analyze the packets. The MA5620E does not receive the SUB command delivered by the SoftX3000. The error 435 reported by the MA5620E exists in the signaling packet of the SoftX3000.
3. The user does not place the phone on the hook for a long time. After the user places the phone on the hook, the sub message delivered by the Softx3000 is lost. If the user takes the phone off the hook and then places the phone on the hook frequently at this moment, the resource cannot be released and the user cannot make phone calls. The solution is that the Softx3000 should deliver the SUB command to delete inconsistent terminals and contexts after receiving the error 435 reported by the MA5620E.
4. Upgrade the SE2300 to V200R005C03B053 through the SBC to solve this problem completely. 
Root Cause
A user does not place the phone on the hook for a long time. After the user places the phone on the hook, the sub message delivered by the Softx3000 is lost. If the user takes the phone off the hook and then places the phone on the hook frequently at this moment, the resource cannot be released and the user cannot make phone calls. The solution is that the SoftX3000 should deliver the SUB command to delete inconsistent terminals and contexts after receiving the error 435 reported by the MA5620E. 
Suggestions
Null

END