Carlos Chavez wrote:
The card itself does not have hardware echo cancellation so we use MG2. I am not fixated on the card because this should not affect a SIP to SIP internal call unless the card is really defective and provides bad timing to Asterisk.
Actually when bridging channels Asterisk acts as either a low level packet router ("Packet2Packet" or "Local" bridge - RTP packet is read in, minimally modified, and immediately sent back out) or as a higher level media forwarder (RTP packet is read in, dissected some, stuffed into internal data structure, shipped off to other channel, RTP header added, packet sent - although monitoring/recording/transcoding is involved it's in that list of operations too). Timing from an external source isn't used. So really, I'm fairly certain it's something to do with your phones. If you could post a short snippet of a phone calling another and the bridge that occurs I could be more certain.
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