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SPA504G delay prior sending audio (or no audio) on call pick up

cedriclegoux
Beginner
Beginner

Found this random issue at few customer sites.

Customer is complaining of no audio after answering the phone.

This is a random issue observed on SPA504G phone with firmware 7.5.4 and 7.4.7

From what I can see in the traces phone is sending 200 OK, received an ACK then will send a BYE without RTP been sent

Is this a known issue ? I couldn't find anything regarding this but this affect few of our customers

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