[cisco-voip] RTP ports used by phones

[Anthony Holloway]

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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