[Freeswitch-dev] Would like to contribute bypass media feature for freeswitch/skinny
Hello Freeswitch devs, we would like to contribute the bypass media feature for the skinny implementation in freeswitch. I've contacted Mathieu and Nathan (the mod_skinny devs/authors) previously, and they recommended to write to this mailing list for the core questions. My first step would be to get a general understanding how to accomplish that feature, and any advice would be very much appreciated. My background: I've been contributing a few patches skinny already, but don't have a real understanding of the core functionality of freeswitch. From the discussion with Mathieu and Nathan, we've agreed that implementing Codec negotiation would be the first step - which is not yet implemented in Skinny. Switch_core_media seems to offer that functionality in general, however Skinny does not operate with SDP descriptions. So my first questions would be: * Should mod_skinny generate SDP generations to interface with the freeswitch codec negotiation? Or are there any other alternatives to interface with the current implementation? * Do you have any recommendations where to look at, maybe a simple implementation? I've been looking into sofia, but I felt a little lost to be honest.... * are the any other requirements to consider? Thank you very much, Simon
I've thought about this before. What does the format look like that skinny uses for media capabilities? Is it possible for it to map to sdp easily? We will either need to translate to sdp, or add more logic in switch_core_media. Mike On Sep 11, 2014, at 2:06 PM, Simon Wunderlich <sw@simonwunderlich.de> wrote:
Hello Freeswitch devs,
we would like to contribute the bypass media feature for the skinny implementation in freeswitch. I've contacted Mathieu and Nathan (the mod_skinny devs/authors) previously, and they recommended to write to this mailing list for the core questions. My first step would be to get a general understanding how to accomplish that feature, and any advice would be very much appreciated. My background: I've been contributing a few patches skinny already, but don't have a real understanding of the core functionality of freeswitch.
From the discussion with Mathieu and Nathan, we've agreed that implementing Codec negotiation would be the first step - which is not yet implemented in Skinny. Switch_core_media seems to offer that functionality in general, however Skinny does not operate with SDP descriptions.
So my first questions would be: * Should mod_skinny generate SDP generations to interface with the freeswitch codec negotiation? Or are there any other alternatives to interface with the current implementation? * Do you have any recommendations where to look at, maybe a simple implementation? I've been looking into sofia, but I felt a little lost to be honest.... * are the any other requirements to consider?
Hello all, How it works: - during registration of the phone, the server asks for the supported capabilities - the phone answers (skinny is a binary format) with: * capabilities count * each capability = (payload, max frame per packet, g723 bitrate, unknown) ; payload being an int mapped to g711, ulaw, ... ; the two last fields being mostly null * currently, mod_skinny stores this "codec list" in the db - on media negociation, the server calculate the negociated codec, and send an OpenReceiveChannel to the phone with some parameters including payload (same int as above), MS/packet, G723 bitrate. Echo cancel type is also sent. Currently this is hardcoded ulaw - the phone answer with a openreceivechannelAck message, giving the IP and port - the server send a startmediatransmission to the phone, giving the remote ip and port, the payload, MS/packet, G723 bitrate and an optional max frames per packet. Silence suppression is also sent. This is also currently hardcoded to ulaw. Hope this helps 2014-09-11 22:13 GMT+02:00 Michael Jerris <mike@jerris.com>:
I've thought about this before. What does the format look like that skinny uses for media capabilities? Is it possible for it to map to sdp easily? We will either need to translate to sdp, or add more logic in switch_core_media.
Mike
On Sep 11, 2014, at 2:06 PM, Simon Wunderlich <sw@simonwunderlich.de> wrote:
Hello Freeswitch devs,
we would like to contribute the bypass media feature for the skinny implementation in freeswitch. I've contacted Mathieu and Nathan (the mod_skinny devs/authors) previously, and they recommended to write to this mailing list for the core questions. My first step would be to get a general understanding how to accomplish that feature, and any advice would be very much appreciated. My background: I've been contributing a few patches skinny already, but don't have a real understanding of the core functionality of freeswitch.
From the discussion with Mathieu and Nathan, we've agreed that implementing Codec negotiation would be the first step - which is not yet implemented in Skinny. Switch_core_media seems to offer that functionality in general, however Skinny does not operate with SDP descriptions.
So my first questions would be: * Should mod_skinny generate SDP generations to interface with the freeswitch codec negotiation? Or are there any other alternatives to interface with the current implementation? * Do you have any recommendations where to look at, maybe a simple implementation? I've been looking into sofia, but I felt a little lost to be honest.... * are the any other requirements to consider?
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participants (3)
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Mathieu Parent
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Michael Jerris
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Simon Wunderlich