sip screws

1. Authentication and encryptionThe role of certification (Authorization) is to show who you are, to prove to others who you are. The associated concept is MD5, which is used for authentication security. Note that MD5 is just a hash function and is not used for encryption. Because the hash function after processing the data can not reverse recovery, this way others can not steal your authentication identity password.Encryption (encryption) is the role of the data to be transferred to the process

First, let's take a look at my sip. conf file, as shown below: [201] User= 201 Type = friend Secret = 1234 Host = dynamic Context = incoming [202] User= 202 Type = friend Secret = 1234 Host = dynamic Context = incoming [1234] User= 1234 Type = friend Secret = 1234 Host = dynamic Context = incoming [0] User = 0 Type = friend Secret = 1234 Host = dynamic Context = incoming [1] User = 1 Type = friend Secret = 1234 Host

In many cases, the SIP does not go directly to the target host, but goes through many intermediate node servers. In the request message, the Via header field indicates the nodes that have passed through (each node passes through, add a via header). In the response message, the via header field indicates the node that the message will go through next (each time the request is returned from the original path, a via header is deleted from each node ). T

Prack English translation (the provisional Response acknowledgement), you can call IT security information! This compares the image.The final response in the SIP is understood to be reliably transmitted, such as a 200OK response to the invite, and UAC will give an ACK telling UAS that it has received 200OK. The reliability between 200 and ACK is end-to-end. Prack is a mechanism for guaranteeing the reliable transmission of temporary messages (101-199)

In PPC development, you sometimes need to hide the sip. There are many ways to hide the SIP in Windows Mobile 5.0. The following are several methods: 1. shsippreference (m_hwnd, sip_down ); 2. sipinfo Si; Memset ( Si, sizeof (SI )); Shsipinfo (spi_getsipinfo, 0, Si, 0 ); Si. fdwflags = ~ Sipf_on; Shsipinfo (spi_setsipinfo, 0, Si, 0 ); 3. shfullscreen (hdlg, shfs_showtaskbar, shfs_hidesipbutton );

In Windows Phone, when the input box gets the focus, the soft Input Panel (SIP) is automatically displayed for the user to input. When we click the physical rollback key, the SIP will be automatically hidden. So what event is triggered? Where should we write code for other operations? We can register the keyup event in the input box. When the input box obtains the focus and click the back button, the syste

In my previous article, I introduced how to use a SIP Soft Phone for direct calls. However, if many other users need to talk to each other, at the same time, authentication and control of User Account logon is required based on security considerations, in these cases, you need to establish a sipserver.Role of sipserver:Call control and processing functions, business provision/support functions, user management functions, protocol processing functions,

From The From header field contains the logical flags of the requesting initiator, which may be the user's Address-of-record. Just like the To header field, the From header field also contains a URI and can contain a displayed name (SIP display info). To The To Header field is the first and also the "logical" receiving place that specifies the request first ("First" is because it may refer to another receiving place), Or the Address-of-record of the

I began to study the VOIP/SIP agreement from 09, open source project also saw a few, the earliest Pjsip 05 began to push the time, began to pay attention to, also in their own winmobile project used. Later also saw Sipdroid,imsdroid (Doubango), Linphone,csipsimple (PJSIP).I think the best advantage of Linphone and Csipsimple,linphone is the full platform support, Android,ios,winphone,windows,linux,mac osx,web all support, but the quality is still unde

Requirement Specification Directory 1: Target and scope 1.1jain-Sip API description 2: Introduction 2.1 System Overview 3: requirement definition 3.1 jainsip Target Model 3.2 jainsip naming conventions 3.3 jainsip Structure 3.4 General primitives 4. External requirements 4.1 External Interface 4.2 Resource requirements 4.3 acceptance test release 4.4 documentation requirements 4.5 lightweight requirements 4.6 Quality Requirements 4.7