[Serusers] Problems using REFER method using SER and Cisco gateway

[Raffaele]

Hello Richard,

thanks for your answer.

I think my case is a little bit different. Read below,

Richard wrote:

>>My question is: is there any way to configure SER changing the REFER
>>message in order to "force" the gateway to send the INVITEs through the
>>server?
>>
>>Or, anyone knows if something more than dial-peers has to be configured
>>on Cisco gateways?
>>
>>    
>>
>
>The short answer is no. It is not supported by cisco. It is a problem not
>limited to cisco. Some other pstn gateways have the same problem.
>
>Here is the official cisco answer, 
>
>Cheers,
>Richard
>
>
>When a REFER is received by the SIP SPI, it passes the refer-to header up 
>to the application.  This contains the entire uri of the transfer target. 
>The app then extracts the user portion of the uri to get the E.164 
>number.  The app expects the user portion of the uri to be an E.164 
>number.  If it's not, transfers won't work today. 
>  
>
But the uri the phone passes to the gateway is in the format 
205 at nat_public_ipaddres where 205 is an internal number.

I have a dial peer configured in this way:

dial-peer voice 5 voip
 application session
 destination-pattern 2[0,1,5].
 session protocol sipv2
 session target sip-server

and when I debug on the router the dial-peer is correcly matched. 
However the gateway doesn't send the INVITE to the sip server but 
directy to the "nat_public_ipaddress

>It sounds like you are requesting the application to perform some 
>additional logic to do a dial-peer match on the domain portion of the 
>refer-to URL rather than doing a dial-peer match based on the extracted 
>E.164 number.  
>
>This would require enhancement to the IOS application 
>code.  I'm not sure how involved these changes would need to be - that 
>would require more investigation if this enhancement is pursued. 
>
>In addition to the above IOS changes, it would require the user to 
>configure a voice class uri and apply this uri to the outgoing dial-peer 
>using the 'destination uri' dial-peer config. 
><http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_configurati
>on_guide_chapter09186a00801d2ac5.html> 
>  
>
I will try using voice class.

Thanks again,
Raffaele.

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