Aastra Telecom 57I CT, 55I, 53I manual DNS Caching, Configuring Dhcp

Configuring the IP Phones

IP Phone Administrator Guide

Network Settings

Protocol	Format	Examples
FTP	ftp://user:password@ftpserver	option tftp-server-name “ftp://192.168.1.45”;
		option tftp-server-name “ftp://ftpsvr.example.com”;
		(for anonymous user)
		option tftp-server-name “ftp://userID:password@
		ftpsvr.example.com”;
TFTP	tftp://tftpserver	option tftp-server-name “192.168.1.45”;
		option tftp-server-name “tftpsvr.example.com”;
		option tftp-server-name “tftp://tftpsvr.example.com”;

DNS Caching

The IP phones have the ability to cache DNS requests according to RFC1035 and RFC2181. The phone caches DNS lookups according to the TTL field, so that the phone only performs another lookup for an address when the TTL expires.

Configuring DHCP

You can enable and disable DHCP using the configuration files, the IP phone UI, or the Aastra Web UI.

Configuration Files

For specific parameters you can set in the configuration files, see Appendix A, the section, “Network Settings” on page A-6.

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