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Symptom
To create test SIP calls to a Dialogic IMG Integrated Media Gateway using a hostname rather than IP address, a local DNS server is required.
Reason for the issue:
IMG Gateways support SIP calls that use a FQDN (Fully Quallified Qualified Domain Name)
Note: The following procedure was tested on a Dialogic Gate Control Element Management System (GCEMS) server running Redhat ES 3.0
IMG Gateways run a DNS client that is configured to send a DNS request to the DNS server for SIP calls.
Configuring a static DNS server on Linux Red Hat ES3:
1. Decide on a domain name.
2. Edit the /etc/resolv.conf file and add the loopback ip as the first entry in this file.
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4. In the /var/named folder create a file for each zone created in the named.conf file above.
Create /var/named/gcems_lf.com.zone.
The following example uses these values:
Host name: lforsberg
Domain name: gcems_lf.com
Use this file to add static DNS entries.
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service named restart
chkconfig named on
36. Use nslookup or dig to test a DNS entry to verify it will resolve the name. Errors are logged in the /var/log/messages file.
GCEMS ClientView configuration
1. Create the DNS Servers:
• In the External Network Elements add the DNS Servers object.
• For the Domain Name enter the domain name of the DNS server.
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Create a new DNS server:
• Enter the name and IP address of the DNS server
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For each IMG Gateway add the DNS Client. If multiple servers were configured select the primary, secondary and tertiary server.
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Add a SIP gateway.
• Gateway Address Type = Host name
• Gateway IP address. This is required for inbound calls as IMG Gateways do not support reverse DNS lookups.
Note: if the DNS server is using a pool of addresses for the host name and the IP address returned to a DNS request is not the same as configured below, the call will be rejected.
• Gateway host name. If the Domain name entered in the DNS servers object is valid, then you only need to enter the host name here: otherwise, you will need to enter the full host.domain name.
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Debug information can be obtained as follows:
> n
zNet> D
Server Set Table
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09:55:20.344 CALL(SIP) (01:00008:01) RCVD 100 Trying from 10.129.51.149:5060 UDP CSeq:1
Glossary of Acronyms / Terms
DNS - Domain Name Server
FQDN - Fully Qualified Domain Name