200 Answering Compatability

[hadleyrich]

Hello,

Thank you for publishing this lovely piece of software.

I was trying to interop with a Grandstream Video Doorbell. I discovered that the Grandstream won't ACK a "200 Answering" but will ACK a "200 Ok".

This is a bug on the Grandstream side and not baresip which is within spec, but I'm wondering if it would be acceptable to have a way to work around this?

I see "Answering" is hard-coded here:

baresip/src/call.c

Line 1310 in 997c113

int call_answer(struct call *call, uint16_t scode, enum vidmode vmode)

Perhaps that could be made modify-able by inheriting a config option from the account config?

I'm not much of a C coder but would be happy to try and generate a PR but wanted to check that that would be an acceptable addition or whether you would prefer not to include workarounds for silly user agents.