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The global servers object allows you to configure ENUM and E911 servers as well as DNS global settingsglobal DNS, call recording criteria and SRS Group Profile configurations. The 'servers' object includes global configurations for DNS servers used for SIP NAPTR, SRV, and A-record lookups.

When the ERE receives multiple records with the same order value and preference for a NAPTR query, the ERE considers only the first record received to resolve the route. If it does not find a route for the chosen record, it returns a 'no route found' response, and will not consider other records to resolve the route.

However, in the case where the order value and preference are different for the received records, the record chosen to resolve the route is based on the RFC rule. In this scenario, if the ERE/PSX does not find the route for the chosen record, it returns a 'no route found' response, and will not consider other records to resolve the route. 

The ENUM server returns a NAPTR response with an IP address to the SBC. To route a call to the IP Peer associated with this IP address, ensure the following is provisioned in ERE.

1. Configure a SIP Domain with the IP address of the IP Peer.
2. Create an IP Peer using the IP address above, and associate this IP peer to a routing label.
3. Configure a Username Routing entry using SIP Domain from step 1, and attach the routing label created in step 2.

The SBC supports load balancing across ENUM servers for individual ENUM zones using enumDomainName, lwresdProfile and enumDomainNameLabel parameters described in this section. ENUM client routes the query to ENUM servers based on the load balancing scheme configured for that zone. ENUM client uses the following load balancing schemes to route the requests to ENUM servers. For details, refer to ENUM Support.

• Sequential
• Round Robin
• Proportional

Global DNS Servers

High Level Command Syntax

% set global servers 
	dns global
		ednsFailureCounte911 <1-5>
		ednsPayloadSize <512-4096 bytes>
		ednsRetryAfter <60-180 seconds>
		iterationCount <0-32>   
		monitoringInterval <0-300> 
		probeInterval <0-300> 
		retransmissionCount <0-20> 
		retransmissionTimer <100-10000>
		timeouts <0-32>
	e911 
		<e911_service_name>
		criteria triggerCriteria <criteria>
		defaultTreatment <applyFinalTreatment | routeAsDialed>
		flags active <disable | enable>
		requestTimeOut <0-2147483647>
		routePrecedence <local | lro>
	e911VpcDevice <device_name>
		deviceData <0-32767>
			ipAddress <ip_address>
			portNumber <0-65535>
	enumDomainName <domain_name>
		forwardersData <0-99999>
			forwarderDescription <description>
			forwarderIP <IPv4 or IPv6 address>
		loadDistribution <proportion | roundRobin | sequence> 
		queryRetryTimer <0-10000 ms>
		zoneType individual
	enumDomainNameLabel DEFAULT_ZONE_LABEL enumDomainNameId <enumDomainName's name>
	enumService <name>
		criteria triggerCriteria <criteria>
		defaultTreatment <applyFinalTreatment | routeAsDialed>
		enumDefinitions privateDomainNameForEnumLookups <private_domain_name>
		flags 
			active <disable | enable>
			processCallingNumber <disable | enable>
			processNewANI <disable | enable>
		priority <129-140>
		requestTimeOut <0-2147483647>
		serviceType <cnam | lnp | sipAor>
	lwresdProfile <profile name>
		description 
		enableLwresdLog 
		enumDomainNameLabel

Command Parameters

Global DNS Servers Parameters

e911VpcDevice <device_name>
	enumDomainName <domain_name>
	enumDomainNameLabel DEFAULT_ZONE_LABEL enumDomainNameId <enumDomainName's name>
	enumService <name>
	lwresdProfile <profile name>
    domainController <server name> description <description> userName <username> password <password> primaryIP <x.x.x.x> ldapQueryCriteria <criteria> searchScope <search     scope>
    adService <Service Name>
       priority <Num>
       criteria triggerCriteria <criteria>
       flags active <enable/disable>

Command Parameters

• ednsFailureCount – The maximum number of EDNS failure responses allowed, after which the DNS server is identified as unsupported for EDNS. (range: 1-5 / default = 3)
• ednsPayloadSize – Specifies the global EDNS payload size, in bytes, for DNS Servers. (range: 512-4096 / default = 1280
• ednsRetryAfter – Specifies the number of seconds to wait before retrying to establish EDNS support after a failure. (range: 60-180 / default = 180>
• iterationCount – Global Iteration count limit for DNS iterations of server requests. (range: 0-32 / default = 8).
• monitoringInterval – Global monitoring interval (in seconds) for DNS Servers. (range: 0-300 / default = 5).
• probeInterval – Global probe interval (in seconds) for blacklisted DNS Servers. (range: 0-300 / default = 5).
• retransmissionCount –  Global retransmission count limit for DNS iterations of server requests.  (range: 0-20 / default = 2).
• retransmissionTimer –  Global retransmission timer value (in milliseconds) for DNS iterations of server requests. (range: 100-10000 / default = 500)
• timeouts – Global number of time outs for blacklisting a DNS Server. (range: 0-32 / default = 0).

• forwarderDescription <description> – Textual description of each fowarderIP entry.
• forwarderIP <IPv4 or IPv6 address> – ENUM server IPv4 or IPv6 address of this forwarderIP entry.

• enumDomainNameId <enumDomainName's name> – The enumDomainName of each ENUM domain to attach to this enumDomainNameLabel.

enumService

N/A

• description – Textual description of lwresdProfile (length: 1-255 characters)
• enableLwresdLog – Use this flag to enable/disable LWRESD log.
  
  • disable (default)
  • enable
• enumDomainNameLabel –  The ENUM domain name label created for enumDomainNameLabel entity. Use this parameter to associate the lwresdProfile with a particular enumDomainNameLabel.

Global ENUM Service Parameters

To support ENUM services for SBC in ERE mode, manually create an ACL rule towards ENUM server to allow the packets (ENUM responses) from ENUM server into SBC. See the CLI example below.

% set addressContext default ipAccessControlList rule ENUMSEV precedence 1 protocol any sourceIpAddress <ENUM_SERVER_ADDRESS> sourceAddressPrefixLength 32 action accept fillRate 50 bucketSize 50 state enabled 

Command Examples

To configure E911 server, execute the following CLI commands:

% set global country 1 listOfNumberOfDigitsToMatch criteria 10,6,3,0  
% commit 
% set profiles digitParameterHandling numberTranslationCriteria DEFAULT_E911 none Sonus_NULL Sonus_NULL 4451211022 1 lookupType e911 
% set global servers e911 DEFAULT_E911 flags active enable 
% set global servers e911VpcDevice DEFAULT_E911 deviceData 0 ipAddress 10.6.30.137 portNumber 9000 
% set global servers e911 DEFAULT_E911 vpcDevice DEFAULT_E911 
% set global servers e911 DEFAULT_E911 criteria triggerCriteria DEFAULT_E911
% set global servers domainController adaserver userName rbbn password ribbon1 searchScope CN=Users,dc=sonusqa,dc=net ldapQueryCriteria cn=* primaryIP 10.50.10.20
 % commit

To configure global ENUM service, execute the following CLI commands:

1. Configure numberTranslationCriteria for calledUri as below

   Code Block
   language none
   % set profiles digitParameterHandling numberTranslationCriteria ENUM_CR calledUri ims.comcast.com Sonus_NULL 9876543210 1 lookupType enumCnam

2. Provision enumService:

   Code Block
   language none
   % set global servers enumService ENUMSER1 criteria triggerCriteria ENUM_CR % set global servers enumService ENUMSER1 serviceType cnam flags active enable

3. Configure the private domain 'ims.comcast.com' for ENUM service.

   Code Block
   language none
   % set global servers enumService ENUMSER1 enumDefinitions privateDomainNameForEnumLookups ims.comcast.com

    

   Configure the ACL rule and management interface static route for the domain controller’s IP. This is to ensure that the management interface is used to send the LDAP query and packets from the AD server are allowed reach the application. The following is an example:

   Code Block
   set global servers domainController adaserver userName rbbn password ribbon1 searchScope CN=Users,dc=sonusqa,dc=net ldapQueryCriteria cn=* primaryIP 10.50.10.20

   The following is an example of how to Create Ad Service and associate trigger criteria:

   Code Block
   set global servers adService ADSERV1 priority 10 set global servers adService ADSERV1 criteria triggerCriteria Test set global servers adService ADSERV1 flags active enable