[Spce-user] Missing ACK when dial from peering to SPCE

John Murray john.murray at skyracktelecom.com
Thu Sep 24 15:15:14 EDT 2015

Hi Tung,

The ACK is probably malformed.
Please send 200 OK and ACK packets

The Contact: header in the 200 OK and the URI in the ACK must match.



On 24/09/2015 19:36, Tung Tran wrote:
> Dear all
> I have this scenario:
> Caller from PSTN (via Cisco gateway 5400) dialed DID number which was 
> assigned to an ATA ( grand stream HT701). Call was hit SPCE just fine 
> and connected but no audio from both sides, and call was disconnect 
> after 30 seconds
>  I ran wireshark on SPCE and saw SPCE didnt forward ACK message from 
> Cisco gateway to client (HT701), so I guest HT701 was waiting for ACK 
> before starting RTP session, and it dropped call after timeout
> Please see the call flow for detail
> Inline image 1
> Anyone got that issue before please share how to fix it?
> ---
> Best regards,
> *Tung Tran*
> *V247 Enterprise Corp
> *713.358.2257 <tel:713.358.2257> office   | 281.857.3448 
> <tel:281.857.3448> cell
> 9999 Bellaire Blvd., Ste. 1111* | *Houston, TX 77036
> *tung.tran at V247.com | www.V247.com <http://www.v247.com/>*
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*John Murray *
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