[asterisk-users] Grandstream RTPkeepalive packetscausing Asteriskwarning

[Steve Langstaff]

Sorry Drew - I don't know enough about Asterisk to comment on the
effects of this on the RTP stack.


________________________________

	From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Drew
Gibson
	Sent: 31 July 2007 15:02
	To: Asterisk Users Mailing List - Non-Commercial Discussion
	Subject: Re: [asterisk-users] Grandstream RTPkeepalive
packetscausing Asteriskwarning
	
	
	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] 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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	-- 
	Drew Gibson
	
	Systems Administrator
	OANDA Corporation
	416-593-6767 x322
	www.oanda.com

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