[asterisk-users] g729a compatibility

[Elliot Murdock]

Hello Jeff,

Yes, I use G729 all the time.

Here is the SDP extrace from Wireshark.  I'll get more data as it
becomes available:

Session Description Protocol
            Session Description Protocol Version (v): 0
            Owner/Creator, Session Id (o): MG4000|2.0 49743 83164 IN
IP4 216.48.184.27
                Owner Username: MG4000|2.0
                Session ID: 49743
                Session Version: 83164
                Owner Network Type: IN
                Owner Address Type: IP4
                Owner Address: 216.48.184.27
            Session Name (s): -
            Connection Information (c): IN IP4 216.48.184.27
                Connection Network Type: IN
                Connection Address Type: IP4
                Connection Address: 216.48.184.27
            Time Description, active time (t): 0 0
                Session Start Time: 0
                Session Stop Time: 0
            Media Description, name and address (m): audio 25184
RTP/AVP 18 98 96 97 101 13
                Media Type: audio
                Media Port: 25184
                Media Proto: RTP/AVP
                Media Format: ITU-T G.729
                Media Format: 98
                Media Format: 96
                Media Format: 97
                Media Format: 101
                Media Format: Comfort noise
            Media Attribute (a): rtpmap:98 G.729a/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 98
                MIME Type: G.729a
            Media Attribute (a): rtpmap:96 G.729ab/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 96
                MIME Type: G.729ab
            Media Attribute (a): rtpmap:97 G.729b/8000
         Media Attribute Fieldname: rtpmap
                Media Format: 96
                MIME Type: G.729ab
            Media Attribute (a): rtpmap:97 G.729b/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 97
                MIME Type: G.729b
            Media Attribute (a): rtpmap:101 telephone-event/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 101
                MIME Type: telephone-event
            Media Attribute (a): fmtp:101 0-15
                Media Attribute Fieldname: fmtp
                Media Format: 101 [telephone-event]
                Media format specific parameters: 0-15
            Media Attribute (a): fmtp:18 annexb=no
                Media Attribute Fieldname: fmtp
                Media Format: 18 [telephone-event]
                Media format specific parameters: annexb=no
            Media Attribute (a): ptime:20
                Media Attribute Fieldname: ptime
                Media Attribute Value: 20
            Media Attribute (a): rtpmap:13 CN/8000
                Media Attribute Fieldname: rtpmap
                Media Format: 13
                MIME Type: CN

Thank you,
Elliot

On Thu, Jul 2, 2009 at 4:04 PM, Jeff LaCoursiere<jeff at jeff.net> wrote:
>
> On Thu, 2 Jul 2009, Elliot Murdock wrote:
>
>> Hello!
>>
>> Which RFC specifies the corresponding number of the formats?
>>
>> Where in the Asterisk source code does it state the SDP formats?
>>
>> Does Asterisk follow the formats of IANA?
>> (http://www.iana.org/assignments/rtp-parameters)
>>
>> Thank you,
>> Elliot
>
> Perhaps this is falling back too far, but do you have G.729 licenses for
> your asterisk server?
>
> j
>
>
>>
>>
>> On Thu, Jul 2, 2009 at 3:44 PM, Elliot Murdock<murdocke at gmail.com> wrote:
>>>
>>> Hello,
>>>
>>> Thank you clarifying that.
>>>
>>> However, if that is the case, why is Asterisk sending back PCMU
>>> packets (instead of G729), which the device is not enabled for and
>>> subsequently, fails the call?
>>>
>>> Could the mapping be disabled or not properly mapping to the G729
>>> driver in a certain versions of Asterisk?
>>>
>>> Thanks,
>>> Elliot
>>>
>>> On Thu, Jul 2, 2009 at 3:25 PM, Kevin P. Fleming<kpfleming at digium.com>
>>> wrote:
>>>>
>>>> Elliot Murdock wrote:
>>>>>
>>>>> Hello!
>>>>>
>>>>> I noticed that the SIP packet contains this line:
>>>>>
>>>>> m=audio 60000 RTP/AVP 18 98 96 97 101 13
>>>>>
>>>>> However, there is no rtpmap that describes 18.  Media format 18
>>>>> Apparently refers to G729, but there is no rtpmap in the SDP for it.
>>>>> Since G729 is a registered and known format is there any way for
>>>>> Asterisk to negotiate it within an explicit rtpmap?
>>>>
>>>> Yes, that is already supported. Asterisk does not require rtpmap entries
>>>> for well-known (RFC specified) codec mappings.
>>>>
>>>> --
>>>> Kevin P. Fleming
>>>> Digium, Inc. | Director of Software Technologies
>>>> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>>>> skype: kpfleming | jabber: kpfleming at digium.com
>>>> Check us out at www.digium.com & www.asterisk.org
>>>>
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>>
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