Hi.
QUESTIONS and ANSWERS
1. (D) +421906200201 also registers, what is wrong, because to be registered only +421906200200. How do I remove it?
Add the command "no sip-register" under dial-peer 201 pots. Check the registration using "show sip-ua register status" command.
2. (C) Between registration +421906200200 and additional registration +421906200200 is a certain time (about 15 seconds), if the router is not registered. Is it right or wrong?
You can check the registration timer using "show sip-ua register status" command.
The first registration has a little delay but every re-registration process starts always before the expiration time. In every case, the registration timeout is negotiated during a SIP REGISTRATION in REGISTER-200 OK messages and the router uses always the lowest value. In your case the SBC forces the timer to "expires=220" so 220 seconds. This behaviour is normal.
3. (C) Which means P-Associ-URI: +42190620020, +421906200! [, +421906200! [, +42190620020. This is probably wrong, how do I fix it?
This is a fresh IOS feature. There are no problem. You can ignore it. More info here: http://www.cisco.com/c/en/us/td/docs/ios/voice/cube/configuration/guide/vb_book/vb_book/vb_9397.html
P-Associated URI
The Cisco Unified Border Element supports the use of PAURI headers sent as part of the registration process. After the Cisco Unified Border Element sends REGISTER messages using the configured E.164 number, it receives a 200 OK message with one or more PAURIs. The number in the first PAURI (if present) must match the contract number. The Cisco Unified Border Element supports a maximum of six PAURIs for each registration.
Note 
The Cisco Unified Border Element performs the validation process only when a PAURI is present in the 200 OK response.
The registration validation process works as follows:
•The Cisco Unified Border Element receives a REGISTER response message that includes PAURI headers that include the contract number and up to five secondary numbers.
•The Cisco Unified Border Element validates the contract number against the E.164 number that it is registering:
–If the values match, the Cisco Unified Border Element completes the registration process and stores the PAURI value. This allows administration tools to view or retrieve the PAURI if needed.
-If the values do not match, the Cisco Unified Border Element unregisters and then reregisters the contract number. The Cisco Unified Border Element performs this step until the values match.
4. (A, B) I joined 2 faxes:
- fax PSTN (type: Panasonic KX-FP701, +421 2 5341 82 73)
- fax router (model KX-FL403, +421906200201, voice-port 0/0/1)
From fax PSTN I sent fax message to router, but from fax router I don´t sent fax message to the fax PSTN. Why? Wireshark is the following message: (T.38: Malformed Packet: T.38).
There is a codec negotiation error.
In this case your cisco detects a fax and it tries to switch to T.38 fax relay but in SIP/SDP there is alto a vocal codec. There are three connection header:
After that, it tries to negotiate T.38 only but there are too many information:
Could be an IOS problem. Can you upgrade IOS and try again?
Regards.
