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SIP: How to cross two ASGs

Hi all,

I have this configuration:

SIP client ---(LAN)---> ASG_A ---(DMZ)--->ASG_B--->(Internet)---Remote SIP proxy

By enabling the SIP proxy on both ASGs I'm able to establish the SIP session but the RTP traffic is not routed.
Pratically, from SIP client, I can dial remote SIP client (the phone rings) but then I can't hear voice traffic.

Here the ASG_A config:

Transparent Mode: off
Outgoing Interface: External eth
Route other calls via smarthost: Internal ASG_B IP addess

Then the ASG_B config:

Transparent Mode: off
Outgoing Interface: External eth
Route other calls via: DNS SRV/Host lookup

By analyzing the packet filter rules, I found that the RTP rule (udp spts:1:65535 dpts:16384:32766 ACCEPT) doesn't detect any traffic on the ASG_B while ASG_A shows few bytes on INPUT and OUTPUT chains.

any idea?

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0 RFCat_vk_01 over 18 years ago

I suspect the proxy on ASG-B isn't looking for that port range as local traffic,
Secondly the SIP proxy is not affected by the filter rules.

Ian M
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0 mdallagi over 18 years ago in reply to RFCat_vk_01

Hi RFCat_vk

the SIP iptables rules are the same on both the ASGs...although, it seems that the ASG_A doesn't route RTP traffic to ASG_B while it did for SIP. In fact I can make a call but I can't hear the voice...

Perhaps I have forgotten some configuration....I don't know
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