[asterisk-users] Grandstream RTP keepalive packetscausing Asteriskwarning

[Drew Gibson]

Thanks Steve,

am I correct in assuming that Asterisk will ignore this packet? It will 
not have any harmful effect if the caller is on hold for an hour (120 
packets)?

In order to feed back to Grandstream, is there a "correct" format for a 
keepalive message or is this one adequate?

regards,

Drew



Steve Langstaff wrote:
> Your Grandstream device is using a UDP message of 8 x 0x00 bytes as 
> it's RTP keepalive message.
>  
> When Asterisk tries to read this it logs a warning because it is 
> expecting a valid RTP packet. 
>
>     *From:* asterisk-users-bounces at lists.digium.com
>     [mailto:asterisk-users-bounces at lists.digium.com] *On Behalf Of
>     *Drew Gibson
>     *Sent:* 30 July 2007 19:55
>     *To:* Asterisk Users Mailing List - Non-Commercial Discussion
>     *Subject:* Re: [asterisk-users] Grandstream RTP keepalive
>     packetscausing Asteriskwarning
>
>     Hi Steve,
>
>     The following packets match the offending warnings on the *
>     console by time and number of occurrences and . The SRC and DST
>     ports vary between calls (naturally) but the rest remains the same.
>
>
>     Frame 3 (60 bytes on wire, 60 bytes captured)
>     Ethernet II, Src: Grandstr_0b:a5:3e (00:0b:82:0b:a5:3e), Dst:
>     Dell_3e:05:ac (00:13:72:3e:05:ac)
>     Internet Protocol, Src: 10.1.10.184 (10.1.10.184), Dst: 10.1.10.1
>     (10.1.10.1)
>     User Datagram Protocol, Src Port: avt-profile-1 (5004), Dst Port:
>     13608 (13608)
>         Source port: avt-profile-1 (5004)
>         Destination port: 13608 (13608)
>         Length: 16
>     Checksum: 0x8e5f [correct]
>     Data (8 bytes)
>
>     Data is 8 x null (00)
>
>     regards,
>
>     Drew
>
>
>
>     Steve Langstaff wrote:
>>     Grab a network trace (with e.g. Wireshark) and look at the payload type
>>     and lengths of the RTP keepalive messages - if you post this information
>>     to the list I'm sure someone will comment on what's happening.
>>
>>       
>>>     -----Original Message-----
>>>     From: asterisk-users-bounces at lists.digium.com <mailto:asterisk-users-bounces at lists.digium.com> 
>>>     [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
>>>     Drew Gibson
>>>     Sent: 26 July 2007 19:23
>>>     To: Asterisk Users Mailing List - Non-Commercial Discussion
>>>     Subject: [asterisk-users] Grandstream RTP keepalive packets 
>>>     causing Asteriskwarning
>>>
>>>     Grandstream GXP-2000 with firmware 1.1.4.18 (beta) fixes an 
>>>     issue where the phone did not send rtp keepalives when on 
>>>     mute (resulting in disconnect from tech support hold and concalls)
>>>
>>>     A side effect seems to be that Asterisk pops the following 
>>>     warning on the console...
>>>
>>>     Jul 26 14:06:35 WARNING[31654]: rtp.c:463 ast_rtp_read: RTP 
>>>     Read too short
>>>
>>>     Grandstream say they are not sure what it is but "it should 
>>>     not affect anything".
>>>
>>>     In other words, "Don't worry, be happy!".
>>>
>>>     Any thoughts/experience on this?
>>>
>>>     regards,
>>>
>>>     Drew
>>>
>>>     --
>>>     Drew Gibson
>>>
>>>     Systems Administrator
>>>     OANDA Corporation
>>>     416-593-6767 x322
>>>     www.oanda.com <http://www.oanda.com>
>>>
>>>
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>
>
>     -- 
>     Drew Gibson
>
>     Systems Administrator
>     OANDA Corporation
>     416-593-6767 x322
>     www.oanda.com <http://www.oanda.com>
>         
>
> ------------------------------------------------------------------------
>
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-- 
Drew Gibson

Systems Administrator
OANDA Corporation
416-593-6767 x322
www.oanda.com

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