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<div>Hi,</div>
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<div>I am designing an integration between Nortel CS1000E running release 5.0 and CallManager 4.2 using SIP trunk, I would be running an IVR on Nortel which would have menu options for Cisco IP Phone users, I just wanted to understand how would DTMF work across the two systems over SIP , Do I need a hardware MTP with callmanager as well. I have looked at document available on Cisco Interoperability portal for Nortel CS 1000M and Cisco callmanager 4.1 , it mentions END to END DTMF is not supported. What do they mean by END to END DTMF. Any help would be appreciated.</div>
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<div><a href="http://www.cisco.com/en/US/solutions/ns340/ns414/ns728/networking_solutions_products_genericcontent0900aecd805b561d.html">http://www.cisco.com/en/US/solutions/ns340/ns414/ns728/networking_solutions_products_genericcontent0900aecd805b561d.html</a></div>
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<div>Thanks,</div>
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<div>Aman</div>