[cisco-voip] RTP ports used by phones

[Ed Leatherman]

I did not catch the port that it was receiving on, must have been a valid
port as it didn't bounce anywhere that I could find in syslog.

On Tue, Jan 19, 2016 at 4:10 PM, Anthony Holloway <
avholloway+cisco-voip at gmail.com> wrote:

> The Phone would offer up it's own UDP port of...in your case...32768, to
> CUCM, then CUCM converts this to an MGCP message and sends to the gateway.
> This way the gateway knows where to send RTP.  So, if anything, it's the
> phone's fault for offering up 32768, not the gateway.  Did you happen to
> catch what port the gateway was receiving RTP on?
>
> On Tue, Jan 19, 2016 at 12:55 PM, Ed Leatherman <ealeatherman at gmail.com>
> wrote:
>
>> Come to think of it, the session was between an IOS MGCP gateway and the
>> 8945 - perhaps something the gateway is trying to send to the phone that I
>> dont realize.
>>
>> On Tue, Jan 19, 2016 at 11:54 AM, Ryan Huff <ryanhuff at outlook.com> wrote:
>>
>>> Ed,
>>>
>>>
>>>
>>> http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/port/10_0_1/CUCM_BK_T537717B_00_tcp-port-usage-guide-100/CUCM_BK_T537717B_00_tcp-port-usage-guide-100_chapter_01.html
>>>
>>>
>>> Could it be that you're seeing something from the ephemeral port range
>>> 32768 – 61000?
>>>
>>>
>>> Thanks,
>>>
>>>
>>> = Ryan =
>>>
>>>
>>>
>>> Email: ryanthomashuff at outlook.com
>>>
>>> Spark: ryanthomashuff at outlook.com
>>>
>>> Twitter: @ryanthomashuff <http://twitter.com/ryanthomashuff>
>>>
>>> LinkedIn: ryanthomashuff <http://linkedin.com/in/ryanthomashuff>
>>>
>>> Web ryanthomashuff.com
>>>
>>>
>>> ------------------------------
>>> *From:* cisco-voip <cisco-voip-bounces at puck.nether.net> on behalf of Ed
>>> Leatherman <ealeatherman at gmail.com>
>>> *Sent:* Tuesday, January 19, 2016 11:46 AM
>>> *To:* Cisco VOIP
>>> *Subject:* [cisco-voip] RTP ports used by phones
>>>
>>> I've notice this a few times bouncing on ACL, thought it was worth
>>> asking about.
>>>
>>> I see in numerous documentation that CUCM uses 16384 - 32767 for RTP -
>>> the documents specifically say IP Phone to IPVMS.
>>>
>>> I observed an 8945 Cisco phone listening on 32768 and 32769 (assuming
>>> RTP and associated RTCP) due to access list not permitting it. Is there a
>>> doc somewhere that shows different/expanded range of ports that Cisco
>>> phones will use?
>>>
>>>
>>>
>>> --
>>> Ed Leatherman
>>>
>>
>>
>>
>> --
>> Ed Leatherman
>>
>> _______________________________________________
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>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>
>>
>


-- 
Ed Leatherman
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