Symptom
IOS and IOS-XE are not updating RFC2833 payload type.
Conditions
### Call Flow ###
Analog Phone-->(FXS)-->VG204 (ISR4K)-->(SCCP)-->CUCM-->(SIP)-->SIP System (It could be any)
Note: This applies to any IOS or IOS-XE running STCAPP service.
There is have to be a media renegotiation and payload type needs to change from one value to another one, between one StartMediaTransmission and another StartMediaTransmission. E.G:
### Initial media negotiation:
ORC
StartMT --> RFC2833 PT: 100
ORCACK
### Media renegotiates:
CRC
ORC
StopMT
StartMT --> RFC2833 PT: 101
ORCACK
Workaround
Avoid payload type renegotiation.
