You can configure this parameter in the phone configuration XML file (cfg.xml) by entering a string in
this format:
<Secure_Call_Serv ua="na">Yes</Secure_Call_Serv>
• Make sure that SIP Transport parameter of the extension is set to TLS.
• Access the phone administration web page. See Access the Phone Web Interface, on page 104.
Procedure
Step 1 Select Voice > Ext(n).
Step 2 In the Call Feature Settings section, in the Secure Call Option field, choose Optional to retain the current
secure call option for the phone, or Required to reject nonsecure calls from other phones.
You can configure this parameter in the phone configuration XML file (cfg.xml) by entering a string in this
format:
<Secure_Call_Option_1_ ua="na">Optional</Secure_Call_Option_1_>
Options: Optional and Required
Default: Optional
Step 3 Click Submit All Changes.
Configure the SIP Transport
For SIP messages, you can either specify the transport protocol of your choice, or, you can let the phone select
the appropriate protocol automatically, for each extension.
When you set up automatic selection, the phone determines the transport protocol based on the Name Authority
Pointer (NAPTR) records on the DNS server. The phone uses the protocol specified in the record that has the
lowest order and preference. When there are multiple records with the same order and preference, the phone
looks for a protocol within the records, in the following order of preference: 1. UDP, 2. TCP, and 3. TLS.
The phone uses the first protocol that it finds, in that order of preference.
You can also configure the parameters in the phone configuration file with XML(cfg.xml) code.
Before you begin
Access the phone administration web page. See Access the Phone Web Interface, on page 104.
Procedure
Step 1 Select Voice > Ext(n), where n is an extension number.
Step 2 In the SIP Settings section, set the SIP Transport parameter by selecting a transport protocol for SIP messages.
You can configure this parameter in the phone configuration XML file (cfg.xml) by entering a string in this
format:
Cisco IP Phone 8800 Series Multiplatform Phone Administration Guide for Release 11.3(1) and Later
193
Cisco IP Phone Configuration
Configure the SIP Transport
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