Cisco UCM SIP trunk to AVAYA S8800 using different RTP ports

Hi Experts,
I have a Cisco UCM version 7.0 and my system is connected to a AVAYA system via SIP trunk. I have a question about a request that I just receive from the AVAYA VOIP engineer requesting for me to change the Cisco VOICE traffic to use UDP port 52048 – 53339 to match his side.

Questions:
What is the impact to my Cisco UCM or is this even recommended?
What ports Cisco UCM uses for VOIP traffic?  Is it RTP 16384 – 32767?

Any documentation that you can share about the implication to the Cisco UCM when using different port range will be great…  
db21Asked:
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José MéndezConnect With a Mentor Commented:
By the way, if you are curious about why Cisco chose 16000 to 32000, its because its the Unix kernel port range.
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José MéndezCommented:
Cant change.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/port/7_0/CCM_7.0PortList.pdf

The RFC doesn't specify which ports are to be used, only that RTP uses even nubmers, RTCP odd numbers.
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José MéndezCommented:
Also you can check other sockets by going to

https://yourCcmAddress:8443/cmplatform/ipprefsFindList.do
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db21Author Commented:
Thanks Willy. So you cant change the default RTP port range? or its not recomend to change it? i need to find a documentation that i can support my claim and it is not recomended to change them and send it to the AVAYA team
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José MéndezCommented:
You can say TAC sent you that document.
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José MéndezCommented:
db21,

Callmanager 7.1.5 allows you to change the RTP port numbers. Go to Device > Device Settings > Sip Profile and change the "Start Media Port" / "Stop Media Port" fields. Then assign this profile to your SIP trunk.
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