Cisco Jabber client not connecting? Discover why incorrect DNS settings are the most common cause and how DNS impacts Jabber connectivity—essential knowledge for the Cisco Certified Field Technician (CCT) exam.
Table of Contents
Question
A user complains that their Cisco Jabber client is unable to connect. What is the most likely issue?
A. Incorrect HDMI cable
B. Incorrect DNS settings
C. The user needs a new IP phone
D. The switch is turned off
E. The router is set to factory default
Answer
B. Incorrect DNS settings
Explanation
Cisco Jabber relies on DNS to locate the CUCM and presence servers. Incorrect DNS settings can prevent connections.
Incorrect DNS settings are the most likely cause when a Cisco Jabber client is unable to connect. Cisco Jabber relies on DNS to locate critical services such as Cisco Unified Communications Manager (CUCM) and presence servers. The client uses DNS SRV records (like _cisco-uds and _cuplogin) to automatically discover server addresses and establish connections. If DNS is misconfigured, missing required records, or pointing to the wrong server, Jabber cannot resolve the necessary service locations and fails to connect.
Common symptoms of DNS issues include errors like “Cannot communicate with server” or “Cannot recognize your service domain.” Troubleshooting typically involves verifying the presence and correctness of DNS A and SRV records, ensuring the client is using the correct DNS server, and confirming network reachability to the servers.
Cisco Jabber depends on accurate DNS configuration for service discovery and connectivity. Incorrect DNS settings prevent the client from finding CUCM and other required servers, resulting in connection failures.
Cisco Certified Field Technician (CCT) certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Cisco Certified Field Technician (CCT) exam and earn Cisco Certified Field Technician (CCT) certification.