Manual Chapter : SIP ENUM Resolution Capability using iRule

Applies To:

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BIG-IP LTM

  • 16.0.0, 15.1.0, 15.0.1, 15.0.0, 14.1.2, 14.1.0, 14.0.1, 14.0.0, 13.1.3, 13.1.1, 13.1.0
Manual Chapter

SIP ENUM Resolution Capability using iRule

DNS team has developed an iRule called RESOLV::lookup to perform a DNS query . From release 11.5.0, its capability was improved to support resolving NAPTR and SRV addresses as well. SIP ENUM resolution mainly involves resolving Telephone number to an IP address. This process normally involves 4 steps namely
  • Normalizing the telephone number to an ENUM address format.
  • Perform NAPTR resolution on ENUM to retrieve SRV records.
  • Perform SRV resolution to retrieve Domain Name records.
  • Perform DNS query to retrieve the IP Address.
RESOLV::lookup with its new capabilities could potentially be used to resolve ENUM to IP Address.
Eg: NAPTR resolution to retrieve SRV records.
RESOLV::lookup @$static::dns_vs inet -naptr "4.4.2.2.3.3.5.6.8.1.4.4.e164.arpa"