I have discovered a bug in the SPA8000 firmware with the 6.1.3 release. I have noticed that outbound calls will fail if we disable the unneeded codecs. If we leave the unneeded codecs enabled, outbound calls will not fail and will negotiate the correct codec.
If anyone is having problems calling out on a SPA8000, making the following changes might solve your problem:
Network Address Translation (NAT) Settings for Lines on PAP2T and SPA3102 Phone Adapters
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