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An AG User Hears the Busy Tone After Taking the Phone off the Hook Because the RTP Resource of the Softswitch of Company Z Is Not Configured

Publication Date:  2012-07-25 Views:  46 Downloads:  0
Issue Description
In an office, the newly deployed MA5620E-24 is interconnected to the softswitch of company Z through the H248 interface to provide the VoIP service access. After the H248 interface is interconnected to the softswitch successfully, an access network user cannot hear the dial tone after taking the phone off the hook and cannot make phone calls normally in the test. 
Alarm Information
Null
Handling Process
1. Check the user data of the MA5620E. The data configurations of the tid template and softswitch are consistent.
2. Trace the signaling of the caller connected to the MA5620E. The softswitch of company Z sends the busy tone message after the MA5620E allocates the RTP resource.
3. Check the softswitch of company Z. The RTP resource range is not configured on the softswitch.
4. Configure the RTP resource range (A100000001�A100000024) on the softswitch of company Z and then phone calls can be made normally. 
 
Root Cause
Trace the H248 message signaling:
9d: [174][15:38:49.960]msg from mgc([10.35.64.66]:2944) to mg([10.35.181.7]:2944): !/1 [10.35.64.66]:2944 T=2307916641{C=21{S=A100000021}}
9d: [175][15:38:49.960]msg from mg([10.35.181.7]:2944) to mgc([10.35.64.66]:2944): !/1 [10.35.181.7]:2944 P=2307916641{C=21{S=A100000021{SA{rtp/dur=50,rtp/os=0,rtp/or=0,rtp/ps=0,rtp/pr=0,rtp/pl=0,rtp/jit=0,
9d: [---]rtp/delay=0}}}}
9d: [176][15:38:49.970]msg from mgc([10.35.64.66]:2944) to mg([10.35.181.7]:2944): !/1 [10.35.64.66]:2944 T=2307916642{C=21{MF=A0{SG{cg/bt}}}}
9d: [177][15:38:49.980]msg from mg([10.35.181.7]:2944) to mgc([10.35.64.66]:2944): !/1 [10.35.181.7]:2944 P=2307916642{C=21{MF=A0}}
According to the preceding signaling message, in the ADD reply message reported by the MA5620E, the ID of the RTP resource allocated to the temporary terminal is A100000021. According to the normal process of the protocol, the softswitch should play the ring tone to the callee and send the Modify command and alerting message (al/ri) to the MA5620E. The softswitch of company Z, however, sends the busy tone message (cg/bt). Therefore, this problem must be solved from the softswitch of company Z. In Huawei MA5620E and SoftX3000, the range of the RTP resource occupied by the temporary terminal is from A100000001 to A100000024 by default. The range of the RTP resource occupied by the temporary terminal must be configured manually on the softswitch of company Z. The softswitch of company Z cannot identify the RTP terminal number reported by Huawei MA5620E. As a result, the busy tone is played after offhook. 
 
Suggestions
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