Non-numeric payload type

[asaks]

Non-numeric payload types can be present in the "media" field, for example, the type t38 will be specified for fax (m=image 15002 udptl t38). In this case, calling the function std::vector<int> parsePayloads(const std::string& str) will crash.

[Maurotb]

Hi, same problem for
a=rtcp-fb:* transport-cc
a=rtcp-fb:* ccm fir
a=rtcp-fb:* goog-remb
a=rtcp-fb:* nack
payload is not numeric