Avaya 4600 User Manual

HTTP is potentially a more secure alternative to TFTP, particularly when Transport Layer 
Security (TLS) is used to create HTTPS (Secure HTTP). You can store the same application 
software, script file, and settings file on an HTTP server as you can on the TFTP server. With 
proper administration, the telephone seeks out and uses that material appropriately. However, 
the 4600 Series IP Telephone must already be running Release 2.2 software to be able to 
access and use HTTP servers. As with TFTP, some functionality might be lost by a reset if the 
HTTP server is not available. For more information, see 

and 

The Domain Name System (DNS) is a distributed Internet directory service. DNS is used mostly 
to translate between domain names and IP Addresses. Release 1.5 and later Avaya IP 
Telephones can use DNS to resolve names into IP Addresses. In DHCP, TFTP, and HTTP files,

 

DNS names can be used wherever IP Addresses were available as long as a valid DNS server 
is identified first. See 

A Network Address Translation (NAT) is an application that can be administered between your 
network and the Internet. The NAT translates network layer IP Addresses so your local intranet 
IP Addresses can duplicate global, Internet addresses. A detailed discussion of NAT is beyond 
the scope of this document. Note that NAT use can lead to problems that affect the consistency 
of addressing throughout your network. In Release 1.6 and earlier releases of the 4600 Series 
IP Telephones, NAT is not recommended for networks handling IP-based telephony traffic. As 
of Release 1.7, all 4600 Series IP Telephones support NAT interworking. Therefore, no 
problems exist with NAT and Release 1.7 of the 4600 Series IP Telephones. Note that support 
for NAT does not imply support for Network Address Port Translation (NAPT). Specifically, the 
4600 Series IP Telephones do not support communication to the PBX through any NAPT 
device.

NAT requires specific administration on the media server. The capability to have a direct Avaya 
IP Telephone-to-Avaya IP Telephone call with NAT, also called “NAT shuffling,” requires Avaya 
Communication Manager Release 1.3 software. See the Administration for Network 
Connectivity document listed in