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8220 terminal one-way problem in cross-subnet internal network

Publication Date:  2012-09-26 Views:  61 Downloads:  0
Issue Description
The original video platform of a local carrier is established on public network. For internal promotion, it will be changed to private OA network. For controlling the network using, every branch offices are divided to different network segments. Bundle the MAC address and IP address of every terminal, and make IP static mapping. In calling process (point to point or multipoint), the phenomenon of one-way audio occurs frequently, and far-end terminal has phenomenon of blank screen. The contacts cannot be delivered between terminals.
Alarm Information
Null
Handling Process
1. Check GKM call policy, one side at least has been selected to check call information by MG and telnet. Ensure the call has passed MG and change the policy to any condition, but the fault still exists.
2. Analyze this network carefully and find that the mapping policy is one-to-one IP static mapping. So the registration IP checked by GKM is not same with real IP. After asking HQ we ensure it is the reason. Add real IP address mapping in the NAT setting of 8820 interface and reboot terminal. Fault disappears and the call becomes normal.
Root Cause
Analyze the network condition and fault phenomenon, we ensure this problem causes by cross internal calling.
Suggestions
This kind of fault often occurs in cross network segment. So analyzing the network construction will contribute to locate and solve the problem. What’ s more, pay attention to the difference between two NAT setting in terminal manu.

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