Both B and C are correct. Probably a multichoice question...
The external firewall must allow the following inbound connections to the
Expressway-E:
SIP: TCP 5061
HTTPS: TCP 8443
XMPP: TCP 5222
Media: UDP 36002 to 59999
Source: Official Cert Guide
That is wrong.
The SIP:TCP 5061 is not valid.
Only between Expressway-C and On-premises Infrastructure you need to open a SIP TCP Port. And the TCP Port is 5060, not 5061. Port 5061 is used for TLS.
Connections Between Off-premises Endpoints and the Expressway-E only needs to be opened for SIP:TLS 5061, not for SIP:TCP 5060.
Have a look at the reference tilo1988 mentioned in his comment.
So only B is correct.
This an MRA scenario (screenshot), this should be a multiple answer question. In which case B, C and D are all correct.
B) XMPP (IM and Presence)
C) SIP signaling
D) UDS (phonebook and provisioning)
These should be opened ports according to the Cisco documentation, in order to for connections between Off-premises Endpoints and the Expressway-E (Table 2):
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-0/ip-port/exwy_b_cisco-expressway-ip-port-usage-configuration-guide-x15/exwy_m_mobile-and-remote-access.html
A. Media UDP 36000-36011 seems too short of a range for RTP flows. In the documentation it states 36000-59999 UDP.
Pfff my bad, HTTPS is 443 or 8443 in this case.
Again B & C look possible answers, but since it's not a multiple answer question, only B anyways.
TLS is used for SIP. But on the firewall you would open TCP 5061 anyway. TLS run on top of that using certificates.
I agree the answers should be B & C. While tilo1988 points out that the protocol running on port 5061 is actually TLS, the question is what do you have to open on the FIREWALL. The access list requires you to open TCP port 5061, TCP Port 5022, TCP port 8433, and UDP36000 - 59999. TLS is actually a secure layer that runs on TOP of TCP/IP.
This answer almost got me. SIP is almost right but offnet SIP incoming should be SIP TLS not TCP so that's incorrect. Only valid answer provided is XMPP TCP 5222
Based on following LINK and page 18(SIP Calls) + 29 (MRA Connections):
https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/Cisco-Expressway-IP-Port-Usage-for-Firewall-Traversal-Deployment-Guide-X12-5.pdf
SIP UDP: 5060
SIP TCP: 5060
SIP TLS: 5061
XMPP TCP: 5222
RTP/RTCP: 36000-59999
There could be ONLY one correct answer B (XMPP: TCP 5222)
upvoted 5 times
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