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ENUM Parameters

The parameters for the communication are: - Record-Type: NAPTR - Domain: e164enum.tmtvelocity.com - IPs for the service: To be provided during provisioning, referred below as TMTIP - Port: 53

ENUM Query format

ENUM resolution operates much like reverse DNS lookup. To perform the lookup, the E.164 number needs to be transformed as follows:

• Remove non-numeric characters such as spaces, +, dashes, etc. (e.g. number “+40766-610060” needs transforming to “40766610060”).
• Reverse the digits and add a dot between every digit (e.g. 40766610060 becomes 0.6.0.0.1.6.6.6.7.0.4)
• Add suffix domain e164enum.tmtvelocity.com (e.g. the number now becomes 0.6.0.0.1.6.6.6.7.0.4.e164enum.tmtvelocity.com)

After transforming the number, perform a DNS lookup looking for NAPTR records:

$ dig -t naptr @TMTIP 0.6.0.0.1.6.6.6.7.0.4.e164enum.tmtvelocity.com

  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40696
  ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

  ;; QUESTION SECTION:
  ;0.6.0.0.1.6.6.6.7.0.4.e164enum.tmtvelocity.com. IN NAPTR

ENUM response

A successful query will return a NAPTR Record with a tel-uri in the format tel:+msisdn. Example:

;; ANSWER SECTION:
0.6.0.0.1.6.6.6.7.0.4.e164enum.tmtvelocity.com. 3600 IN NAPTR 10 100 "u" "E2U+pstn:tel"
"!^(.*)$!tel:1\;npdi\;rn=\;cic=4018720\;cc=ro\;cn=VODA\;nt=mobile\;mcc=226\;mnc=01!" .

The parameters returned are based on RFC4694:

• tel – the original number queried
• npdi – NP Database Dip Indicator (indicates to any downstream systems a portability lookup has been performed)
• rn – Routing Number (LRN for USA/Canada)
• cic – Carrier Identification Code (list provided by TMT)
• cc – Country Code
• cn – Carrier short name (list provided by TMT)
• nt – Number type (mobile/fixed)
• mcc – MCC of the network (if mobile nt)
• mnc – MNC of the network (if mobile nt)

Unsuccessful query response

Unsuccessful queries will be responded to with status NXDOMAIN and a blank answer section.

Example:

$ dig -t naptr @TMTIP 0.6.0.0.1.6.6.6.1.0.4.e164enum.tmtvelocity.com

  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 19974
  ;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
  ;; WARNING: recursion requested but not available

  ;; QUESTION SECTION:
  ;0.6.0.0.1.6.6.6.1.0.4.e164enum.tmtvelocity.com. IN NAPTR

TMT Sip Redirect Server
The purpose of the TMT Sip Redirect server is to provide TMT customers with real-time NP data by redirecting SIP messages to the appropriate routing endpoint based on the current network of the called party.

Simplified, the call-flow is:

• TMT SIP Redirect Server Architecture

For each network in the countries to which the Customer can request NP query, the customer will provide:

• Network (e.g. ‘H3G’, ‘TIM’, ‘WIN’, etc...)
• Contact header information
  • 3xx message type needed (e.g. 300 if multiple routes need to be chosen).
    Recommended: 301 Moved temporarily with Expires header indicating the next NPDB refresh time. This allows the Customer to cache the result until the NP data is refreshed.
  • Prefix (if necessary to prefix the number)
  • New Route(s)

Example:

For network ‘TIM’, the customer wants to be able to send the calls to 10.1.1.1 and 10.1.1.2 with prefix 998. In this example, 10.1.1.1 is the first route and fails the call to 404 not found.

TMT Sip Redirect server can handle any variables in the message type (3xx message type) and any variables in the Contact field for the 3xx message (multiple routes, q=, expires=, prefix).

For each country provisioned, an operators file is provided during the provisioning process. If any time there are movements in the operators list for a provisioned country, an update is sent by TMT Analysis support to its customers with the new operators file.

The files contain the following fields, separated by “;”:

• Service provider ID – unique across the system, TMT assigned. You will find this in the download files as well as in the cic field of the ENUM response. This is the field you should use for mapping to your system.
• Network Short name – unique per country. You will find this in the download files as well as in the cn field of the ENUM response. This field is for quickly identifying networks during operator-assisted tests.
• Network Full name – the full name of the operator
• MCC
• MNC

Example:

filename SK_operators.csv
  4219920;SKOTW;O2 Slovakia;231;06
  4219910;SKOGE;Orange Slovakia;231;01
  4219900;SKTEL;Slovak Telekom;231;02
  4219903;SKSWA;Swan 4KA Slovakia;231;03
  4219930;SKZSR;ZSR Slovakia;231;99