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Incoming call using SIP gateway noisy because of blow

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ophiro2

ophiro2

Technical User
Dec 31, 2004
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When passing incoming call to a Cisco IP throught a SIP gateway and CCM 4.1, I hear a loud blow on the caller phone side.
And when passing the same call using the same gateway but set with H.323, I have a clear communication.

What can be the reason of that ?
nb: I used G711 Alaw for both.
 
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