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Do we require transcoder when two phones communicate with eachother one with a-law and another with u-law?

                   Do we require transcoder when two phones communicate with eachother one with a-law and another with u-law?

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Do we require transcoder when two phones communicate with eachot

No. Phones will automally adapt to U-law.

Do we require transcoder when two phones communicate with eachot

Most phones, at least Cisco endpoints, would support both G.711 mu-law and a-law so Paolo is correct. If for some reason the devices involved didn't both support a common G.711 varient CUCM would invoke an MTP to interwork between them. A transcoder is not required for this re-packetization.

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