20 mar 2010 kl. 14.52 skrev Iñaki Baz Castillo: > 2010/3/20 Olle E. Johansson <o...@edvina.net>: >>> Also, there are cases in which the PSTN gateways reply a 183 followed >>> by a 180. This makes crazy some phones which don't know what to render >>> (real audio of 183 or artificial ringing requested by the 180). >>> >> In the case of using early media just to send a ring tone, I would prefer >> sending 180 with SDP, >> or 180 first, then 183 with SDP. I don't like devices that only send 183 >> with SDP for ring tone. > > Unfortunatelly this doesn't depend just on the device itself, but the > devices connected to it. > > For example, some TDM nodes fake the ringing and generate real audio. > When such TDM signaling arrives to a SIP-PSTN gateway, it must > generate a 183 with SDP :( NO, IT can generate 180 with SDP as default...
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