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  1. Rodger Hosking

    Avaya IPO 500 V2 SIP DTMF Tones Not Reliable

    Thanks, I have contacted the SIP provider to see which codecs are supported. In the meantime, I did one more interesting test this afternoon. I put two phone sets next to each other and used one to call the other. After answering the called set, I pushed digits on the calling set, and...
  2. Rodger Hosking

    Avaya IPO 500 V2 SIP DTMF Tones Not Reliable

    Dear icet500, Thanks for your answer! Here are the codecs we currently have enabled - the original "default" codecs since installation about 6 years ago: G.711 ULAW 64K G.711 ALAW 64K G.729(a) 8K CS-ACELP G.723.1 6K3 MP-MLQ Are you suggesting that we should have only "one" of these enabled...
  3. Rodger Hosking

    Avaya IPO 500 V2 SIP DTMF Tones Not Reliable

    thread940-1768951 We have an Avaya IPO V2 Rev 9.0 system connected to ten Optimum (Altice) SIP trunks since 2014. Right after installation, our installer went out of business, so I've been acting as the administrator since then. Problem: After connection to the destination, we experience...

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