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inspect sip dropping "sip request: MESSAGE" packets

Dennis Goh
Level 1
Level 1


I have 2 ASA 5510 firewalls at 2 different sites. Both running on version 8.0.4. Users are using an Instant Messaging type of application provided by a local telco here which is able to send and receive SMS using SIP (from the packet capture that I've done).

When users use the IM in site A, they are able to send and receive text messages via the IM from behind the firewall. However, when the users are in site B, users are able to send out text messages but not able to receive them.

I noticed that when I remove "inspect sip" from site-B's global policy map, users from site-B can successfully receive text messages. I have confirmed that it is the firewall that drops the packets as I have captured the inside and outside interfaces of site-B's ASA and I can see the incoming sip "request: MESSAGE" packet on the outside interface but I do not see the packet exiting the inside interface.

I have cross check both firewall configurations, and I do not see anything suspicious commands relating to sip that might cause this issue. Is there any command to troubleshoot why the sip inspection is dropping the sip packets on site-B?

Thanks in advance,


15 Replies 15

Dennis Goh
Level 1
Level 1

Hi All,

The issue has been resolve after we have contacted the telco regarding this issue. We posted this issue on the "INVALID TEL URI" to the telco and their product team has resolved the issue. Thanks for your help


Dennis Goh

Review Cisco Networking products for a $25 gift card