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IAD 132e (V300R001C04) one-way audibility

Publication Date:  2012-08-02 Views:  90 Downloads:  0
Issue Description

Before customers use IAD132e with version V100R002B02D059 with static IP adress for Up-link on all IAD and it was work well.
But then they provide new requirement:
1. It need work with dynamic IP adress( by DHCP)
2. MAC adress verification
Current version not suport it, so we upgrate it to V300R001C04, after that it start work with dynamic IP and MAC verification. But after upgrate we catch a problem with one-way audibility.

Problem description:
When user made a call from POTS1 to POTS2 and from POTS2 to POTS1 – all is normal. Both of users can hear each other
But if they try to make a call from POTS1 or POTS2 to external number ( for example to other IAD or AG) or from external number try make a call to POTS1 – User from POTS1 can’t hear opposite site, but opposite site can her him.

Alarm Information
Handling Process
- Problem was in this IP (, because AMG don’t know where this IP in network, and to where need send media package

so the problem war in wrong Media IP. After change it service start work normal.
Root Cause
 Make a mirror port on LAN Switch for make package capture from IAD.
- After making package capture I found that on the beginning when IAD communicate with Soft Switch it use IP which it got by DHCP. But when it start communicate with another device (AMG) for RTP traffic it start to use other IP  - IP on IAD (got  by DHCP) – IP of Soft Switch – IP of AMG – IP on IAD when it start send RTP packages to AMG