ata in wimax enviroment

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Mar 8th, 2010
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i have a test asn gw setup with 3 different service-flows.

1- rtp traffic

2- sip traffic

3- default traffic

when i attach an ata (spa2102) to a cpe i can surf the web, but my call fails. When i look at the gw router sip traffic is flowing and is is being marked properly but there is nothing for rtp. which explains why the call is not going through. but if i remove the service-flow for sip on the asn-gw everything starts working just fine. the rtp traffic is being marked and prioritized. this is what i found out on the ATA:

sip service-flow enabled

- the ata tries using g.711u even though its not in the preferred codec list. even if i say yes to the option "use pref codec only", the ata still tries using g.711u and the call fails. g.729a is the preferred codec and is enabled also.

sip service-flow removed

-the ATA uses g.729a and the call goes through without any problems at all.

ATA info is below.

product name - SPA-2102

Software Version - 5.2.5

Hardware Version - 1.3.5(a)

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Alberto Montilla Tue, 03/09/2010 - 06:39
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  • Cisco Employee,

Dear Sir;

Are you sure that the device enforcing the codec is the ATA? I see you are changing the policies on the ALG but not on the ATA, so actually there should be no difference on the packets going out of the ATAs.

I suggest you check whether it is the CPE the one enforcing another codec.



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