[asterisk-users] SendText causes Retransmission errors

[Kevin P. Fleming]

On 03/16/2012 09:43 AM, Matt Hamilton wrote:
> Hi,
>
> I'm using SendText to send a text message when the user picks up a line
> in a SLA setup (even though I'm not sure the problem is related to SLA).
> I'm on Asterisk 10.2.1 (same in 1.8.9)
>
>
> [from-office]
> ..
> same => n,SendText(hi)
> same => n,SLAStation(line1234)
> ..
>
> Here is a simplified version of the SIP messages:
>
> 1 phone => Asterisk INVITE
> 2 Asterisk => phone Trying
> 3 Asterisk => phone MESSAGE
> 4 Asterisk => phone OK (for the INVITE at 1)
> 5 phone => Asterisk OK (for the MESSAGE at 3)
>
> 6 Asterisk => phone OK (for the INVITE at 1)*** RESEND of 4
> 7 Asterisk => phone OK (for the INVITE at 1)*** RESEND of 4
> ..

Did the phone send an ACK for message 4? If not, that explains why 
Asterisk is retransmitting the '200 OK'. Posting a packet capture of 
this problem occurring would probably provide the details necessary to 
figure out what is going on.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
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