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Command Reference Guide
voip name-service host
Use the voip name-service host command to add a host to the Voice over Internet Protocol (VoIP) name
service (VNS) cache table. Using the no form of this command removes the host from the cache.
Variations of this command include:
voip name-service host <hostname> mgcp
voip name-service host <hostname> mgcp tcp
voip name-service host <hostname> mgcp udp
voip name-service host <hostname> sip
voip name-service host <hostname> sip tcp
voip name-service host <hostname> sip udp
Syntax Description
<hostname>
mgcp
sip
tcp
udp
Default Values
By default, both MGCP and SIP VNS requests use UDP.
Functional Notes
Voice and media signaling protocols (such as SIP) often rely on domain naming system (DNS) in order to
ease configuration and administration of endpoints and also to implement redundancy mechanisms
provided by DNS service records. Because voice and media signaling protocols are often directly coupled
to a user experience, applications are often very sensitive to latency introduced by the DNS mechanism.
AOS voice products rely on the ability to resolve names to one or more service or address records quickly
in order to place a call or register to an external voice server. The DNS server is often not local to the AOS
unit, and it is not guaranteed to be accessible, even when other mechanisms necessary for successful call
completion may be available. A DNS request for a particular host name results in local caching by the AOS
unit, after which the DNS information is quickly available without requiring additional requests. The cache
remains populated until the cached record expires.
60000CRG0-35E
Specifies the fully qualified domain name (FQDN) of the added host.
Specifies that Media Gateway Control Protocol (MGCP) is the service type
for the VNS service request.
Specifies that Session Initiation Protocol (SIP) is the service type for the
VNS service request.
Optional. Specifies that Transmission Control Protocol (TCP) is the protocol
used for the service request.
Optional. Specifies that User Datagram Protocol (UDP) is the protocol used
for the service request.
Copyright © 2012 ADTRAN, Inc.
Global Configuration Mode Command Set
1456
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