Solved: Strange RTP port range from Cisco to recording system

Mustain · ‎01-12-2023

Hi everyone, does anyone have experience with integrating CUCM into Verint recording systems? I have a strange problem with the RTP port, from CUCM <> Verint I allow 16384 - 32767 / UDP but I don't know why when I try to capture traffic from FW, it shows me the RTP port between the endpoint and the Verint recording range of 7xxx - 8xxx. Well, anyone know why?

Thank you for your attention to this matter.

b.winter · ‎01-12-2023

The question is: on which side do you see this range?
You have 2 ranges: One for the CUCM endpoint (which is set in CUCM with 16384 - 32767) and one on the recording system (e.g. 7000 - 8000).

E.g.
Phone sends end receives the RTP packet on port 16384.
Recording sytstem sends end receives the RTP packet on port 7000.

So in the FW you have to consider 2 different directions:
From endpoint to recording system --> UDP / Src.Port range 16384 - 32767 / Dest.Port range 7000 - 8000
From recording system to endpoint --> UDP / Src.Port range 7000 - 8000 / Dest.Port range 16384 - 32767

View solution in original post

fikriiki07 · ‎01-12-2023

Hi, i have the same issue, the fw show rtp port range 6XXX - 8XXX. Can anyone please advise?

b.winter · ‎01-12-2023

The question is: on which side do you see this range?
You have 2 ranges: One for the CUCM endpoint (which is set in CUCM with 16384 - 32767) and one on the recording system (e.g. 7000 - 8000).

E.g.
Phone sends end receives the RTP packet on port 16384.
Recording sytstem sends end receives the RTP packet on port 7000.

So in the FW you have to consider 2 different directions:
From endpoint to recording system --> UDP / Src.Port range 16384 - 32767 / Dest.Port range 7000 - 8000
From recording system to endpoint --> UDP / Src.Port range 7000 - 8000 / Dest.Port range 16384 - 32767

Mustain · ‎01-13-2023

Hi @b.winter

Understood, thank you for your explanation.