You must check if the network is assessed and modified. If the network is assessed and modified, then there may be a network or media module problem. Assuming that multiple IP Telephones are installed, if other IP Telephones experience the same problem there may be a procr, a media module, or a network problem.
If IP Telephone is faulty, replace the IP Telephone.
Verify the transmission speed and transmission duplex (HDX, FDX) compatibility of the IP Telephone and the Ethernet switch by checking the Layer 1 port statistics on the Ethernet switch connected to the IP Telephone.
ADDITIONAL INFORMATION:
If this resolves the problem then no further steps need to be taken.
Install a protocol analyzer in the network to capture live traffic and analyze the network in further detail.
ADDITIONAL INFORMATION:
There must be a network problem. Compliance with the Avaya network requirements might be an issue as well, and a (re-)assessment may need to be done.
