Some SIP providers require that your PBX use a specific SOURCE port when communicating with their network. Voip Your Life (VYL Media) business setup authenticates via public IP address and requires that your PBX use port 5060 as a source and destination port when communicating with their network.
The problem is that by default, Cisco CME does not use a static source port; it uses a random unassigned source port. This resulted in outgoing calls not working. Their device was specifically responding with a 404 not found error (which is not very helpful). To get this to work properly, we had to configure the UC540 to use port 5060 for the source port.
conf t
sip-ua
connection-reuse
end
Additional information from Cisco:
https://www.myciscocommunity.com/docs/DOC-1560
If the provider requires that SIP traffic always be sourced from the UC520 using TCP or UDP port 5060, this can be changed at a system level as below:
sip-ua
connection-reuse
2. Need “deb ccsip message” for this to check the reason for the error. One possibility is mentioned here:
https://www.myciscocommunity.com/docs/DOC-1520#Inbound_calls_from_SIP_Trunk_on_UC520_fail_when_configured_using_CCA_19_or_higher
Earlier posts on NexVortex:
https://www.myciscocommunity.com/message/5595#5595
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By using SIP Providers you can reduce your connectivity charges, simplifies the network and reduce its cost also improves the communication level.