When you say "without number", what exact channel request are you making? In particular, what values (if any) do you provide for TargetID, TargetHandle, TargetHandleType?

I think it's reasonable for some combinations to raise NotImplemented: for instance, it'd be reasonable to believe that TargetHandleType=None (or omitted) is an attempt to "call nobody", which is an unimplemented class of channel (we only support calling contacts), hence NotImplemented is right.

InvalidHandle would be right for a request for { ChannelType=StreamedMedia, TargetHandleType=CONTACT, TargetID="" }, though.

(In reply to comment #1)
> When you say "without number", what exact channel request are you making? In
> particular, what values (if any) do you provide for TargetID, TargetHandle,
> TargetHandleType?
> 
> I think it's reasonable for some combinations to raise NotImplemented: for
> instance, it'd be reasonable to believe that TargetHandleType=None (or omitted)
> is an attempt to "call nobody", which is an unimplemented class of channel (we
> only support calling contacts), hence NotImplemented is right.
> 
> InvalidHandle would be right for a request for { ChannelType=StreamedMedia,
> TargetHandleType=CONTACT, TargetID="" }, though.


I'm providing empty string so the parameters look like this. So all other parameters are correct apart from the TargetID.

 request = {
            ofTChannel + ".ChannelType" : ofTChTStreamedMedia,
            ofTChannel + ".TargetHandleType" : U(HANDLE_TYPE_CONTACT),
            ofTChannel + ".TargetID" : "",
            ofTChTStreamedMedia + ".InitialAudio" : True,
            }

What this is supposed to achieve? InitialAudio is TRUE, so it is supposed to make a call immediately... to where?

The interface specification states this for error codes. So according to that we should get Invalid Handle. I know, it's not really a big issue, but the application using the interface might expect different behaviour.

# Not Implemented
The channel request was one that can never succeed, such as requesting an unsupported channel type, or requesting a channel type which this connection manager does not support with the given target handle type.

# Invalid Handle
An invalid handle was requested as the value of a property whose value is a handle (like Channel.TargetHandle), or a syntactically invalid identifier was requested as the value of a property whose value is the string corresponding to a handle (like Channel.TargetID).

With my telepathy-spec editor hat on, I think Andres is right to expect InvalidHandle here, although it's not very important.

OK, now I dig it. InvalidHandle you get. Fix is in git / 2.1.1.