An engineer is deploying an Expressway solution for the SIP domain Cisco.com. Which SRV record should be configured in the public DNS to support inbound B2B calls?

The correct answer is C. _sip._tcp.cisco.com. For Business-to-Business (B2B) SIP federation, external organizations use DNS SRV lookups to discover the SIP server for a domain. The standard SRV record for SIP over TCP is '_sip._tcp.<domain>', so '_sip._tcp.cisco.com' would allow remote SIP endpoints to locate Expressway-E…

Cisco Expressway for Collaboration

Question

Options

A_collab-edge._tls.cisco.com
B_cisco-uds._tcp.cisco.com
C_sip._tcp.cisco.com
D_cuplogin._tcp.cisco.com

How the community answered

(30 responses)

A
3% (1)
B
3% (1)
C
93% (28)

Explanation

For Business-to-Business (B2B) SIP federation, external organizations use DNS SRV lookups to discover the SIP server for a domain. The standard SRV record for SIP over TCP is '_sip._tcp.<domain>', so '_sip._tcp.cisco.com' would allow remote SIP endpoints to locate Expressway-E and establish calls. The other records serve different purposes: '_collab-edge._tls.cisco.com' is used by Cisco Jabber clients for Mobile and Remote Access (MRA) discovery, '_cisco-uds._tcp.cisco.com' is used by Jabber to discover Unified Communications services (like UCM), and '_cuplogin._tcp.cisco.com' is used for Cisco Unified Presence login. Only the _sip._tcp record is the standard for inbound B2B SIP calls.

Topics

#Expressway#DNS SRV#B2B Calling#SIP

Community Discussion

No community discussion yet for this question.

Full 300-820 Practice