[asterisk-users] Grandstream RTP keepalive packetscausing Asteriskwarning

[Steve Langstaff]

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

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